TAS 10TE-5 User manual

ITT,IPORIANI
PARISOFYOUR
IEI.ESCOPE
1. H2ol,lMeyelens
2. HMl2.5l'lM
eyelens
3. SR4l'leyelens
4. Snnfilter
5. Erecting
prisn
6. 2XBarlowlens
7. Diagonal
prism
8. Dustcap
(not
shown)
9. 60MMobj€ctive
lens
(not
shown)
10.0ewcaporsunshade
ll. objectivenount
withthr€e
"squaring
on"adjustfientscrews
12.Maintelescopetuhe
13. Cradlewithclamp
screws
14.Finderscopemo!tingbfaclet
l5- Finderscope
oblective
(focusing)
16. Finderscopeobjective
lockriig
17. tindelsc0pe
eyelens{ilhcross-hair
18.focusingmountwith
piniongear
andknobs
19.tocusiigtube
20. Eye
lensadapt€r
21.tlexible
controlfordeclination
gear
22. Sun
proiection
screeiassembly
23. 0eclinationaxis
24. 0eclination
axisclanpscrew
25. 0eclimtioncircle
26. 0eclination
circleindicator
274.HourCircle
Indicator
(Moving)
278.HourCircle
Indicator
fixed)
28. llourcircle
(out€r)
29. Hourcircle
(inner)
30. llolraxis
clampscrerv
31.Flexihl€
controlfor
houraxis
gear
32. Polaiaxis
clanpscrew
33.Polaraxhbody
34. Laiitude
Indicaior
35.Latitude
Scale
36.Azimuth
clanpscrelv
37.0eclinatioi
axisbody
38. Counter.pohe
shafl
39. Counter.pohe
shrlt
nut
40. CounteFloiseweight
41. Accessory
tray
42.Tripod
43. Wooden
case
(nol
sho{il)
12 <\..
I \,,\);'
'|
I
}F
?
3
B-29
32
Figure
2

OPTICAL
EFFECT
OBJECTIYE
(Frounhofer
tpe, A.hromotic,
Hord
I,lA6NIFICATION
tongih tight GotheF
NokedEye
RBolving
Double Std15
Dis.e.nible
Slor,
Originol Wilfi Borlow
L€N3
l200nh It8X 11.2m 1.5" 300x,95x, &0x,192X
60x l20x
DESGRIPTION
GENERAL
Every
porl of ihe Model loTE-5 Telescopeis
constlcredc{ the finen quolily moteriols.lt is
designed
ond monufocluredto meel the exocting
req!ireme.tsof criucolosho.omicolobseruoiions.
All
ensesore hod-cooted wlrh mognesiumfluoride to
permitnoxlmumlighrlronsmissionond ore fully
coire.ted for sphericol ond chrcmotic obberolioo
oid como.
Theresolvingpowerof the obieciive ens
exceeds
rhe Ddwesimircrirerionnecessoryro secure
o poini looge.Thislsthe mostimpodori
loctor
in
MA@NIFICATION
The
normoronge
o{ mogiificorionls300X,96X,
ond 60X. By o|oching the Borlow lens ro the
,ele
.)pe alep'e.e
< d rq
l.e'e -qe
ronge
ol nogn
-
Iicorloi is i.creosedto 600X, I92X, ond I20X. In
thiswoy,lheBor
ow lensmokespossible sixmognifi-
coiions,usingonly threeeyepieces.
EYEPIECES
The Mode loTE-5 Telescopeis equippedwith
newly designedeyepieceswirh hord,cootedlenses
whichgiveo shorp, wide,ond tlor core.ted {ierd.
TELESCOPE
MOUNT
Thedesignofthe ToscoTelescopemount isexceed-
ingly
proclicol
ondfundionol.Theuniquecombinotion
of oll-ozimuthond equotoriolmountmokespossible
eosierond more
voriedoperolion.Thisdesignollows
the useo{ the telescopeboth os on eqloioriol tele,
scope for osnonomicol
obseruolionond os on oh-
ozimuthtelescopefor tetresiridl
observotion.
Fordstronomicol
obseruolions,
the
equotoriol
riouni-
ing o lows for complete
odiostmenrof the ozinuth
o\is.polo'o{s.
lour
o:,soadoecl.otiono{is.
Thehour
oxGo.d dechnotionoxis
ore designed
fo. oprionollse olmonuoloperolion
ondslownolion
odilstmeniswith flexible controisond eoch oxrs rs
equipped with d sefiirg cncle, wilh opp.opriote
Theboseot the equotoriol mounungis equipped
wiihoi dzimuthcncle
groduoled
from
0lo 360".
FOCUSING
Thereiso rcckond pinion
mechonicisn
ond on
odiusioble pull,our rube ot ihe eye e.d oi rhe
re/escopewhich provides quick odiushenr when
instolli.g neweyepieces.
USEOFTHETEIESCOPE
IN
TERRESTRIAL
POSITION
To obsdve re(esrriol obiects,
pld.e thetelescope in
lhe potirionshownot lefl. To produceimogeshoving
minimumdistortion
ond whichore righr eide
up, u5e
ihe erecting
prisn ond o widevieweyepiece.

h isbesllo setup yourToscoTelescopein doylight
holrs in orderto beconecompelely
fdmiior wlth
I. Corefully removethe portstfom the box toking
coreto idenrifyrhemos perthe liston Poge2.
2. A ochthetripod legs
toihe boseof rheequotoriol
mo!nl, spreod lhe legs,ond oitochthe triongulor
occe$oriesnoy, Port No. 41. to ihe brockeh ot
rhetripodlegs.use smolwlng nutsond bo1s.
Tightenthe lorge
wi.g nuts
ot thelop o{ eochleg.
3. Open the crodle, Pod No. 13, ond insertthe
le elcopelube, mol.i.g cerro'r rl-orlhe Jocueing
knobsond plnion
geor, PorlNo. 18,ore pointed
downw.rd tFlgure l). Tighlen the crodle wirh
rhumb
screws.
Loosenthe poloroxisclompscrew,
Po. \o. 32. old Il '\e nou.l -o il-e oppro'i-
mole positionos shown in Figure3- Relighien
the polor oxis clomp screws.
ALIONING
IHE FINDERSCO?E
In the doytime, oim the telescopeot o distonl
obiect by sighting
olons the moint!be. Thefu her
owoy the obiect is, ihe berter. Focusihe lelescope
by rotoiingrhe pinion knobs llntil ihe subied comes
intofocls uslng
theH20MMeye lens.Centertheimoge
in fie eyepieceond lighten oll the clomping
screws
securely.
Replocerhe low power eyepiece
wiih the
HI2.5MM ond refocuson the obiectond recenter1r
in the eyepiece- Replocethe HM]2.5MM eye lens
with ihe SR4MM eye lens ond repeot the process.
Whenthe obidt iscenteredin ihe eyepiece,
recheck
ihe clomp screwsfor iightiess. Now, by usingthe
odiustingscrews,odiun the linderscopeso thoi lhe
cro$'hoiE intersec hesome
pointol lhe someobiect
ihot is seen in the cenler of rhe eye lens of the
mdintelescope.Now, your findeB.ope h in reoson'
oble o ignment with the moin telescoperube, but
minor relinementswill be nece$6ry ond should be
donewhilefocused on o stor or o plonet.Thereofter,
providing the relescopeis not iored severely,the
findeccope will be occurorely posiiioned.
ERECTING PRISM
Sincetheostrononlcol
telescope
shows
on inve.led
imqge, on e.ecting prism is needed for lenetriol
viewing.Theered imoge is obroined by usingthe
ereclingprism,Pod No. 5, insteodol lhe diogonol
prism The desired eyepiece is inserled inlo the
erectingpfismond focusingond olher monipLrloiions
ore occomplishedos before.
2X EARIOWLENS
Theue of the Barlowlensdoublesthemognifying
powerof ony eyelensthot k usedwith it. To insioll
this lens,slide it inlo lhe eyepieceslidins sleeve.
ASSEMBLY
5.
6.
Aitoch lhe counierbolonceweight ossenblies,
Ports
No. 38-39-40.
Aloch rher ndeiscopeboclel, Po1No 14. o
the rop of rhe locusingmolni.
Ano.h lhe flexible cont.ol cobles,PortsNo. 2l-
31,lo ihedeclinotionoxis
geor
o.d to lhehour
oris geor. NOTE,lmpodontlThecounrerbolonce
weight mlst be odiustedon ils sho{t.lls position
coJn'e'bolor(e5
_l-e
weigh'
of t\e 'elescope. Tlis
cdnbedo.ebymovingrhehoLro,,s o.d declino-
rion oxis so thot ihe lelescopeis posilioned
os
shownin Figure4. Now,slide the bolon.e weight
or theshotrso
thol lhe lelerope w,I mo,.-o,n
rhebolonceosshownin Fislre 4. Thisshouldbe
occomplishedwhilerhehouroxis.lomp screw,
Po.lNo. 30, is lcrse.
{Do nd use prlsms.)Then,side the eyepieceinio
ihe Borlowlens
ond focusos before.
Becorseorthee'l.en- mog^ifico1on5 wl'en
Lsing
the Borlowlens,
extremecore mud be loken io oim
ond focus
properly.
Thisoccessory
iso voluobleitem
to your lelescopeset,bul ihe extrememogniflcolion
power shouldbe usedonly when necessory-
When
used,the Jield of view ldisloncefrom left to rishl)
will be muchsmoller,ond the imosewill nor be os
brighl ond os shorp.
EYEPIECES
For ostronomicol
viewing ploce one of ihe eye-
piecesin rhediogonolprism ond iryell thediogonol
prisminrothe eye lenr odopter. Rototethe
prism
to o comlorlobleonsle ond focls rheblescope
by roloting lhe pinion knobs. lt is slgge+ed thol
iniiiol obseryoiions be mode wllh the H20MM eye
lens.
A{rerthe obiect
iscentered in the eyepiece ond
focusedproperly,closerobservouonscon be mode
with the H]2.5MM eye lens.l{ tudher mogniticotion
is desned, ihe SR4MMeye lenssholld be used,but
core shouidbe rokei rhot the subiecris cenrered
in the eye lensbeforechonging
the eyepiece.
Engrovedon the cop o{ the eye lensh o lette.
ond numberfollowed by the lerrersMM. The lefler
indicdiesthe lype of lens.
Thus,H or HM indicoies
thot thelensisHuygenionor HuygenionMillenzwoy.
SRindicctesihqt the lens is o modified Rqmsden.
The
numberindicoiesthefocol lengrhof theeyepieco
ond is usedin figuringpowerof the telescope
when
di{ferenilocol lensih eye lenses
ore used.
The mogni{yinspower of ony relescopecon be
.obtoined
by dividins
rhefocollenglhol rheobiective
lensby thefocol lenglhof rheeyepiece
lens.

STATDIAGONAL
PRISU
Thestor diosonol p.ism is o device
conioining
o
right onsle prism.h bends
rhe lisht gotheredbv rhe
obiective
lens
ot righronsle and provides
morecom-
fo oble viewing.When the prismis used,
the imoge
moy be onywhere
lrom right side up but revers€d
fromleftlo risht10completely
upsidedown,
depend-
ing upon the ongle io whichit isturned.
Thh imoge
ottitude
produces
no problems
whenmokingostrono'
micol obse otions since it motterslinle whethero
storor plonetisviewed
upsidedownor right
sideup.
ECIUATORIAL ADJUSTMENTS
SE?TINSUT THE EQUATORIAIMOUXT.
OtE: THESE
ADJUSTMENTS
ARE NOr
DIFFICULT
!U? AREYERYIMPORTANT.
Derermine
thot the top of the hjpod is levelin oll
directions.
Sel the teles.opeiube ver'icollv obove
theDolor
oxisbcdvondosneorlv
porollel
tothePolor
oxi; os possible
(iisure3) Next, loosenihe ozimlth
clomo sirew (poa 36)ond swinsthe nountins right
or lefr rSee "A" figure 3) ro set the Polor dxis
reosonoblv
correctin ozimuth
bv direcling
the polor
o{s bodvioword therruenorthpole
which
liesobout
l" fromPilorisor use
o composondmokeollowonces
tor conpossdeviotionor ihe poini oI obse otion.
Lockozimuth
clompscrew.
Adiustthe loriiudeongle of the polor oxis bodv
,l'sure
3,Ansle
Blroconlorm
w,lhlhe
geogroPhicol
ldrilude oosilion ol lhe oloce of obseaolion Use
the lotitudescoleond indicotoron polor oxisclomp
soew (Dort
32). lf you livein one of ihe cilies
listed
in chort
"A" youconeosily
findyour locorion.
lt your
city is nor included in the cho then check your
locolionin on Ailos or coll your counrysurueyor's
It .eosonoble
<ore hos been lokon {or oligning
the finderscope,
vou should
be oble ro locoreo stor
or plonetin rhefield o{ view of the finderscope-
Us€
the flexibleconrrcls
to bring the obiecr
lo rhe inter'
sectionol the cross-hons
of the findersope. Tfie
someobiect
will be in ihe wide view (60X)
eyepiece
Move
rhehles.ope by odiusringhourond declino-
rion ongles to center stor. DO NOT CHANGE
AZIMUTH
OR POLAR
AXIS(LATITUDE)
POSITION.
Assuming
rholfia lolilude ongie o{ lhe Polor
oxis
iscorrect,
hereis o simplerule to rerine
the setting
C€nlero sro' in lhe lield of viewof the wideview
(60X)
eyepiece.
lf ihe polor oxisis norsetin ozimurh
corecllv, ii will be necessdryio moverhede.linotlon
ond ho;r odiustments
to keep the stor centered ll
the declinotion
wosioword rhe north (ossuming
you
ore locoied in the no hern hemisphere),
the upper
end of the polor oxis (ligure 3, Cl, is pointins too
for wsslword- lf the co.rectioni5 in ihe oPposite
direclion,
rhepolor oxisispointing
loo lor eostwo.d
Loosenozimuihclomp screw,
shifl lhe polor oxis in
Figure3
ozimuth(fioure
3, A, in rhedi'e(lion ndi(oredond
-"k. o hesh htol. Twc or th,ee suchlriols should
DUithe polor oth in correctodiusrmentUsesiors
in widelv seporoiedportsof rhe sky for eochrriol
NOTE, BECAUSE
OF ITS RAPID
MOTION lN DE-
CLINATION, THE MOON DOES NOT MAKE A
PRACTICALOBJECT
FORTHESE
ADJUSTMENTS'
When the ozimuth,laritude,
ond declinqtion
set'
rrnos
hovebeenproperly
cdjusted,
o sror
wtll temon
inih" {ieldot viewior o consideroble
lenslhot rime
For conri.uous
nocking it is only necesn/ 10 od_
vonce hour oxis with Jlexible conrrol When the
DroDor
seh,.qshove been och'eved,
i! resuggesred
ihi o mo'r be scribedon ,he rripod flonse ond
the mounting
pillor of fie Polor
oxisbody, opPosile
the ozimulh clomp screw.
To sove set up rime for
future obseruoiions,
} is suggested
ihot rhreestdne
or concrete
blocks
whh bross
plossinserted
in them
be plqcedin o triongleso os to occommodore
eoch
tripod leg. The hetol poinlson the nipod legscon
be inserted into rhe pluss, thus ossuringcorrect
plocementof lhe telescope
eochtime.

GEOGNAPHICAT
rocaTroNs
Aueu3ra, Main€ 1 39 E
33lC
306E
+ltncfteld, Mrssu.t
Cabbridg., Ma...
c:ode!, N- J.
chabpaiBb, m.
6arlos., N. C- 3 23 E
Charanoosa, Tebn.
Clicago, ruin.iB
coroldo Srincr, coro.7 59 M
309C
coruobu,, ohi.
t
Doase city, xtu3a3 ? .10M
906C
Eut.ne, or€son
a
3294
GarYe.bn, T.xa3
n:rrilburg, P.nra. 3 03 E
?50E
Indis.polir, hd.
J.r,.ycity,N.J.
Kani.,city'(u!.3313c
336E
333E

USEOFIHE SETIINGCIRCLES:
The locorion
of ony obiect in the sky wiihin ihe
ronge of the telescopeis determi.ed by irs rlght
oscensionlhour
ongle)onddeclinotion,verymuchos
ploces
on eorthore ocoredby lotitudeondlongriiude.
The setting circles
permit yoo to index dtectly to
ony srorby setting
your ielescope10cored position
os indexedin on olmonocor sior colologue.
TheTASCOmountingiscompleielyequotorio ond
lhe hourcircle(R.A.) isdeslgned to be usedwith the
single index systemor the double lnder sysrem.
To moke full lse of the seiiing ci.cleswith elther
systemit is necessoryto prepore your equoloriol
mou.ting for your po iculor ploce of observotion
by co(ecling o.y iidexing edor o{ ihe circlesond
their indicotoEin relotionto yo!, geogrophicol
locotion. I is nol necessory1o use your lelescope
for rheseodiustmenis.Thecorection procedures ore
simpleo.d only require reosonoble core in moking
L Mork ielescopecrodle lo show obiedive end.
2. Moke surethot ihe tripod heod is level in oll
3. Doublechecklhe poor oxis seilln9{or lhe
loiitudeond ozim!ihonges.
I. Ploce'hemoLnrirgi. pos_ion
o. howr'. rgLr.
i. DO
NO-
CFANGTLAIIUDTSI
II \G
5. Removelhe couiterbolonce weight from the
couirerbolonce rod. Use
the rod to supporro
6. Level
the
declinolionoxiswhileresringrhelevel
on lhe colnter boldnce rod. Tighrenlhe hour
oxis
clofrp screw
(porl 30r.
7. Slip,lurnrhehourcircleso rhot the 0-0 morkof
rhehour
cncle
isinlinewilhthe
FIXEDindicotor.
L Adiustmovingindexeslby bendiig) so
thol they
point io figures
6 18,6'6 of lhe hour cLcle.
9. Loosenthe decllnolionclomp screw (port 24)
ond ploce the level in rhe ielescope
crodle
Movethe
cfodleunrillevel.Lo.kthe
declinotion
clomp screw Reod rhe degrees opposile rhe
declinolior cncle indicotor
10. Now, loosenihe clompscrews,swingthe crodre
lo rhe opposileslcieol lhe lripod mokingsure
rhor rhe obiective end is poinring os belore
ond repeoi lhe leveling pro.edures. Do not
chonge
polor oxisor ozimuth
settings.Reod
rhe
degreeseitingopposileihe declinouon indico
ior. li probobly wi I not be the some.Splitthe
difference
berwen
these
two reodingsond core-
fully bend lhe deciiolon lndicotor
(po 26l
to ihis coiiecled
selting.
This
e iminotes lhe etror
of differenceberwee.
iro sides
oi theteles.ope.
ll. Loosen
the declinotion holr clompscrew
ond
swinsthecrodle in no.thond southdeclinotion.
'r. c odleis
"On TheM..ido." wh
cl- svey
imporloniin ihe colculotionsof houronglesof
rhesrors.
rhesecolculotiorisore dlwoysfigured
from
your
meridion.
12. Mourt yourtelescope
in the crodle ord clomp
securely.Loosen
rhe
decliiotioncldmp
screwond
seilhe declinotionci.cleot 90'. Double
cnecr
io mokesureihol0-0 isopposiie
thefixed index
ond
ihoi ihe movinslndexopposite6-18.
13. Yo!r lelescopeis now in zero position ond is
poiriing ot rhe celestiolequotor ond you ore
now reody ro index directly 10 o stor.
WITHTHEDOU8LE
INOEX
SYSIEMNO
ANITHMETIC
IS NEEI'ED!
With doubleindexlng
you i.dex directly ro side.eol
timeond then index
directlyto R.A. of the slor.For
exomple,
if you wishto find o stor rhol iscorologued
ot 2:00 R.A. when ir is5,00 sidereol
iime, jr isonly
necessoryto slip-lurnlhe hour circleto pur sidereol
lime (5:00)
of the outer hour cncle in ine with the
MOVINC index. Loosen
the holr oxis clomp screw
(port 301ond turn the te escope
(lhehourcirclewill
move wiih itl in the needed direcuonlo pli 3:0O
of lhe inrer circe in linewiih ihe FIXEDindex.
Loosendeclinoiionclomp screw
(port 24) ond move
lelescopeuntil proper declinoiionongle is indicoied
ond clomp tight. Use
the Wlde View eyepiece
(50X)
10 locotethe sior in the lield of view Use{lexible
controls
to briig the srorto the inteGeclion
of the
cross-hoirsof the linderscope.Now, you con follow
rhetor for ons periods of iimeby orly odvoncing
the hour oxis wilh the {lexible control. f you hove
the electricclock drive it con now be engoged ond
will lollow ouiomoricoly. You
conmove tromonestor
lo onother following lhis procedure.
The only rime
it is ne.essoryro chongethe serup is whenyou 90
from one sideof the tripod io ihe olher. Thenyou
musr
relurn
thetelescope
10zero position ofter which
you proceed
os before.
SINGLE II{DEXING SYSIEM
lf you orc o methodicolperson
ond enioy doing
lhingsi. rhescienlificwoy usingthe nece$oryorilh-
meric involved then the siDge indexing systemis
Forsingle index you do not sel direclly to R.A.,
but rother to o known ongle os colculoted for o
certoir storol o ce oin sidereoliime.Letuso$ume
thct it is 4:00 sidereoliime ond yoo wonl to find o
slor lhot is oi R.A. 1,00.ll is nece$ory to subshoci
1,00R.A.from the 4:00 sidereol time.
The resut
wolld be 3:00 west.- Sinceour exomple gives o
3:00W. colculorionthe telescopeis ploced o. rhe
eostside
of thetripod ot zero posiiion.Slip'tur. the

hourcirclesolhor 4'00 (oursr
circle)isoPposib rhe
hoi:rcircle indicotor.
Clohp lh€ hour oxistishi ond
wirh ihe flexible .onhol the hour oxis is odvonced
ro7'00.
Usethe wjde view eyepiece(60n to locote rhe
storinrhefield of view Usetlexibleconrolsro brins
the siorsto fie intelseclion
of the cross'hoirs
of the
findeGcope.
Now, vou con follow lhe stor for long
perlods
of rimeby only odvon€ins
rheholr oxiswiih
the flexible control. lf you hove ihe eleclricclock
drive it con now be engosed ond will follow
CALCULATINO
HOURAXGLE
As in oll moihemotics,
it i5normolto slbsrrod lhe
smoller
numberfromrhe lorgerone li sidereol
time
is the lorger, subtroctR.A.The resuhwill indicote
hours
westof rhe meredion
Wlen it h necessory
to slbstrdcl tine lrom RA
the resutth hourseo$ of ihe meridion.
Usuolly,
if the resuhsof rhecolculotionsdetermine
o "west" reodinsthetelescope
I pldcedon the eosi
sideof the lripod. With o westcolculolion
the hours
increose
lrom sidereol
iime.
lf the resulis o{ the colculolion determine on
"edst" reodinglhe telescope
is Plocedon the wet
side of the rripod. The setlingso.e lhe some os
before excepr thoi the houE will detreose lrom
sidsreol
iimesothol il is necesory
to sublroct
rother
POSITION
FROMA GUIDE
SIAT
lhe quklesl ord proboblylhe eosiesr
wov rot
lindins
yoursty subieos
is f om d guidetor Tha
ii onoihersystem
for rokingodvontoge
of rheseiiing
circles wiiholr fie necessory
orithmeiic, nor is it
necessory
to determine
sidereol
time.wnh this
system
it isonly necessory
to cenlero lomiliorsior or Plonet
in ihe {ield of the telesope by odiusting
the hour
ond declinotion
onglesmonuolly.
Next sliptu.n the
holr .ncle to the R.A.
os cotologued Withourorith'
freric yo! hove now *t your relescoPecorectly in
sidereol
iime ond you con now index ro orher slors
in thol oreo of the sky by either indexingmerhdd
previouslye!pldined-
Excellent
books to o$ist you in the use oi your
telescope
ore ovoiloble We po iculorlyrecommend
Nolticol Almondc,wriie io U.S Printing
Oflice,
Woshington,
D.C.
Obseiver Hondbook,
write to RoyolAstronomicol
Scciely,
Toronto,
Conodo
sky Publishins
Corp, wlite io Horvord Collese
Obsedolory, Combridge,
Mossochusens
SU FROJECIION
SCREEN
For prolongeosolo. obsNorions, rhesun's
iioqe
con be p'oiec'ed onro the sJn proPec.ron
ereen
Assenblethe sun
screen
05shown
in Fisurel
Mounlthe collor on the end oi the focusing
tube
Screw rhe eye lens odopter in ploce lnsed the
dioqonol prism ond 20/VlM
eyepiecewith lhe sun
filter in ploce. Focus
ihe telescope
on the sun bv
:igf irq lhroJg' ll-e eyeoiece
W\e. lhe sn is
fo;Ger. €mo'e the 20MM eyepiece
ond insert
ihe
12.5 eyepiecein the diogonol prism ond tur' lhe
prism
r lhoi the imose is thrownon the surfoce
ol
ihe D oi".lio" (reen. Re'ocusunnl the iroge is
sl'orpon lhe ptoecnol
(reen The
olhet
eve
lerses
moy be usedfor dif{erentpowers
of mogniti'dtion
CONYERTING
TO SIDETEAI
TIME:
On onorher pose we hove incLlded o sidereol
conveGion
iime chort bosedupon 8 PM your Locol
ln ofder io convert to Sidereol Time ii is tirst
necesso.y
lo determineyour locol Meon Time lf
vou ore Luckyenough
to be locoted
on o Time
zone
verldion vour problemissolved
becor-rse
vour Locol
Meon Timewill be the someos vour Stondord
Time'
lf your clry is locoted in the list ol geogrophicol
locotions
you con determine your time corre'tion
srno,/ bv derernit
ing /out posilron
edstor xesl
o' vou ne 7o_FVeadion.
LGor Meon TrmF
is
colculoled bv o co(eclion equivdlent
to 4 minutes
for eoch desree lhot you ore owoy trom the Zone
Meridion.l{ vou ore wen ol ihe TimeZone
Meridion
Locol Meon lime eqools Stdndord Time MINUS
corredion time. l{ you ore eost ol rhe Time Zone
lleridon, Locol Meon Time equok Stondord Time
PLI.JScorection lime.
Forexomple,
Columbio,
Missouri,is 2'20' wesrof
lhe Time Zone Meridion Thismeons
thot we nust
odd 9 minutes
from StondordTime. lI we ossume
lhot it isI P.M.Slondord
Time
our coriection
shows
rhoi the LocolMeon Timeequos 8,09
Chicoqois 2'22" eostof the Time
ZoneMsridion
ond. rherefore,
n would be necessorv
to dedlct 9
minrtes to Sionddrd Time which sfiows
thot Locol
Meon
Timeis7,51.
Aller vou hovedetermined vour LocolMeonTime
lor 8 P.M.it is simplyo motter ol relerringro rho
sidereolconversion
chortlo set
vourwot.h 01
correcr
sidereol
time{or the dote ond monthof obseryotion.

SIDERiAT
CONYERSION
CHART Ar 8 P.M.LOCALMEANTIME
HO\'Y
TO UsETHIS
CHART:
'1. Deiermineyour
Locol
MeonTime
from
SidereolTime
or 8 p.M.
2. From
thisconversion
chortfindSidereoiTime
forthe
doyondmonth.
3. Whenyour Stondord
Time
clotk shows
8 p.M. pLUS
correctiontime, set your wotch,o
Sidereol
Time
shown
on this chort.
EXAMPTE: Chicogo,
lllinois,
Jr:ne
lsr
l-ocdlMeon
Timeis
7:51
p.M.
WhenSlondord
Time
clockshows
7:51
set
o wotch
at 12:41
SiderolTirne.
OAY JAI{. FEB. /uaocsAPRIL Jua{E JULY ArrC..SE'PT. oca. ftov. Oec. OAf
|o139. t4r!t. 2or4z-
642 to 43 164t ro:l€ zos 22 46
a4a tz 49 t6 49 18
5r 2050 o9
4251 500 to50 t2 5l 1653 tas5 2054 2256 os+ +
301 504 654 656 to54 r455 1859 20 58 zt@ o9
650r 65€ 900 ro
58 t3 0l t4 59 t'l ol t9 ql 7t04 toL 6
3@ 5
rr 02 13
05 t5 03 ll o5 19(', 2r 06 2.306 l6 't
a3t3 900 |l06 130e 150t tl 09 t9tl 2t@ 23lZ tlo 6
93 t-t 5t9 'I to 9t2 ||
to t.3t2 t5 n915 2t l1 ,t6 9
lo !21 S2a 916 t3t6 slt tl 1919 tt8 to
rl 325 tia 920 ll t6 lf 20 ll2l t973 2324 t22 tl
lz 1D 1ZZ 924 ta tt 24 ts22 9n t75
t3 125 2S 13
26 ts 26 931 aaal t30 It
t4 lt !o 13
32 15
30 t935 7t 3t t34 t4
341 543 95 |!4 1534 t73l 1939 tla
t6 s4r '1 3t lt 36 t3 40 15:6 t1 4t943 zt4l 234a r6
t't 349 t7 44 t5 42 t9 41 2t45 2341 t4s n
la 't 45 9 4-1 t34a 15
45 n48 t9
5l 71?p 23 5l t49 18
9tl lt 90 tl 52 t5 50 t1 5Z 1955 23 55 t9
20 ||s4 1356 l5
s4 t'l 56 19
50 7as9 It b
601 7sI l|5l 1558 1800 zooz z2
ol o03 zol
z406 6 il 801 ro
o] t2 0l t6 02 t8 04 zoa6 2os 2
2l 4tz oo5 t2 05 t4 0E taoa 20lo 22c' oI 2l
6r8 609 totl t2 09 t4 t2 t6 to t8 t2 20 t4 zzt3 o15 Lt3 24
2s tor5 tz t4 It t6t4 1816 zot8 22 t6 ot9 2_t'l
26 625 6 r'l to 19 t2 tl t4 t9 t6 t6 ta20 zozz o2a zzl ?5
428 6!O 821 lozt t4 23 t8 24 2b 26 oz1 21
2A 534 625 LO
21 t4 21 ta26 2030 o3l ZE 2E
Do29 to
3l L229 t4ll t6 30 t8 :2 20 44 oy E
b832 to35 12
33 t4 ts t5 3l ta 36 &ra 227 o3a 2t1 b
3l a}6 t531 la qo 240 241

NOTES
ON OISERYATIONS
OISERYING
THESUN
P.operprecouti.nsro preventblindness
musrbc
roken in viewing the sun The use ol ihe sun
proiection :creen is recommended However, it
lr isdesi.ed
ro viewlhe sln diredlv
through
ihe
telescope,use lhe {ollowing pro.edore,
l. Use thesln glosson
theeYepiece
2. Moke o stop o{ cordboord or lhin sheet
netol
w,rh o c
(ulor l'ole o, 2 incheso, lessin
diometer. Fit lhis over the obieclive iens to
reduce rhe omounl of lronsmitted lighr ond
heot. Do not mokethe hole loo smoll,
os this
will tendto reduce
lhe shorpnessof definition.
OBSETYING
THE
MOON
Thercor hosbeeno fovo.irerorger
oI observeB
sinceGolileo firsi viewed ir in 1610. Becouseof
the moon'scomporotive
proxirlrity
lo eodh, ii is
lhe eosiet ond i4ost interestingobied {or the
Crot;rt, fto!nloin ronges,
volleys,
ond other lunor
londscopesore best viewed when they lie neor
thedividingline between
thesunlirond dork PoF
lionsof ife moor. Thebet rine lor lu.or viewing
i! berween
thenewdoon ond o doy or rwo beiore
it islull ond o similorinrervolofter rheioll moon
ond rhe nexrnew moon.The brighr nreoks rodi
oting lrom such pfodinent crote6 os Tycho,
Copernicus,
Kepler, ond orhe6 ore very con-
spicuous
u.de'o highligh or or reor 'he 'ime
To obserye lhe moon
gen€roly, lhe 73X mognili-
corion is the mosts!iroble. This will bring into
view the phenomenono{ eorlhshine, lhe vost
seos of solidilied lovo, the londscope of the
lunor mountoins,ond lhe voriely of the phoses
of the moon. Every incrcosein opticol power
ilcreoseslhe recognToble
teotu'es.
HiJher
rosn:'
ficolions will bring oul in greoter deroil the
crorec, volleys.ond clefts.Reference
shouldbe
mode
to lunormopsoson oid in locoiingspeci{ic
OISERVINC
IHE ?LANETS
Merc{'y ond Ve.ui ore knownos interiorolone's
becciuse
lheir orbits ore neorerto the sun thon
islhb eodht orbil. Thesuperior
plonersorc those
whole orbitsore forrherowoy lrom the sln rhon
is the eo.thlsorbir.
lorcury - Thirplonet ir neverseenin lhe south_
eh sky. ll moy be seenin April or O€tober,
or
ihe rime ol ils greolestelongotioneosl or west-
It mun be vlewed either in fie Milight skv very
shortlyoher sunseror iusl before sunrise.
Sin<e
Mercurycon neverbe morelhon 28' lo one side
or rhe other ol the sun, ir i5 only visible very
neor the horizon{or o shorrtime, .or morethon
rwo hou6. This ploner is viewed through the
dense
ond lurbid loyer of the eorth As o resuli,
Merc!ry hos o reddishoPpeo.onceond is seen
ro rwinkle. lr discloses
phoses
similorio thoseol
Venus
ond ts tiny discis s€ldom
we I ploced for
Vedu3
- This
plonet is never seen in lhe south_
ern sky.lt isihe lhird brightestobied in lhe sky,
exceededonly by rhe 5un ond lhe 6oon. ll is
os brisht os mogniiude 4.4 ond is rwelve times
the mogniiudeo{ Sirius.This
peokbrillionceo{'
cursin lhoseyeols when il is ot perihelion,neor
the end of Decembe..
Venus is besi viewed or
twilight or iusr
beforedown, when the loint light
ol doy serveslo reduce irs brillionce. h is 50
neorlh€ horizonlhot lisimogei5
distoded
becou3e
oI rhe lnsteodinessof eorlht ohosPhere. When
neor inlerior coniunclion,
Venus is often b.ight
enoughto be seenwiih the noked eye in brood
doylighr.lrsphoseiso rhincrescent.
Mo.s - This
plonet mostclose
y resembleseodh
Neor lhe Opposirion,when MoB i5 neoret 1o
eo h, somesurfoce
deioil ond whlte polor cops
moy be oble ed with the useof ot leost l52X
mognificotion.The deioik of iis orongeieddish
disc moy be viewed, bll o red {ilter is re.om-
mendedlo moke o distincicontrod b€lweenlhe
sreen morkingsond the reddlsh
bockground.
lupiter - This plonei ol{ers mony points ol
interestthot con be seen very cleorly. A fine
porollelbelr
lies
o'oL.d rheponers
equolo..
Tl'e
Greot Red Spot lies on its golden'yellow disc
The four Golileon sorellitesore cleorly dis<ern.
ible. Wirh every increose
ln mognilude,
mo.e de'
toil is broughr our in these morklnss.The lour
brightest
sotellite!olJupiter
couse
lronsir,
shodow,
eclipse,ond occlltorion,
oll ol whichore Godily
Soturn- Thisploner ond its rings ore perhops
ihe mostunusuoltpecrocle
in the sky.A rhin,{lot
bond whichsurounds
lhe dull yelLowglobe ol
Solurn is divided inro lwo concentricrings by
"Cossinit Divkon". The foinr porollel beh mork
ingsond five of the plonet'slen knownsoiellires
con be ploinlyseen.
Uronui o.d N€ptune
- Borhof ihese
ploners
con
be seen very eosily. Uronuspresentso vogle
greenishshope.
Neptunepresents o Joint,iregu-
lor,slishtly
sreenish
disc.Theuseof the Americon
Ephem€risond Nouricol
Almonocwill locilnote
fie locolionof lhese
plonel!.
10

"SQUARING ON'
THE TELESGOPE
oo
AA
C
c
Fig!re
5
The obiective hount is equipped with d sPeciol
device which permiE /tquoring on'/ ond centering
Topeforfr pe eciy, theobiective
lensnlst be set
oi o rightongleto theoxis,or centerlineot thetele$
copetube Thisiscolled
'lquoring on" lhe lelescope.
Chooseo limewhenlheohosphere
issteodyo.d
free from crosscureals Slghion o fixed tor ot the
second
mog.ilude. f the leescope
G squoredo.
properlythc storshouldoppeoros o minule/well
defined.cl..ulor
disk
of ish1,s!rro!ndedby oie
or two thln.conceirrlc,brightrlngs Relerence
A
Fig.5 l{ thetelescopeG .ot properlysquoredon,
rhe lghr fromthe sto' enle6 the relescope ob lque
y
ond
theimogeis
dstorted.1wl oppeor
oson
iregu
or imogewltho roil,orcomo,ononeslde iReferen.e
B or C, Figure5. Thiscondilion
is mon evldent
whenihe imogeis
iut olt of focus.
To conect rhlsdisrorrion,odiust
thescrewson the
oblectivemounrro eftect
p'oper
oli9.me.r
Tosquoreon n the doytime,
{olowthis
prfted!re:
L Removetheeyepece
froh rhe
slidi.gsleeve.
2. Coverrhe obleciive
lenswiih ihe dustcop or o
3 Lookinlo ihe obiective
lenstom the end or the
eyepieceseeve Ghosr
lmoges
o{ reflectedight
from everysurfoceof the ens wlll be seen.1l
theseghon moges
ore seenos concenfuiccircles
ReferenceA, Figure 6r, the reescope--nsesore
propery olgned.ll iheseghot imoges
oppeor
theo19nmenrisincotrect
s
l1R
./M
h
rc
fil
AGGESSORIES
AVAILABLE AT YOUR NEAREST
TASGO HEADCIUARTERS
AH4oMM
Eyepiece . ..30?ower
HM25MM
Eyeplece . . 48 Power
H9MM Eyepiece . 133Power
H6MMEyeplece. 200 Power
Voriqble
8.20MM
EyePiece. 60'150Power
srn Diogonol
Prisn
Canerd AdaPler
MoonFiller
Elecl c Clocl Drivc
11
ru 1
r',
i t'f
Al\ 4
t t"''"
II

TRY TELE-PHOTOGRAPHY.
TASCO'S NEW TEL.A.DAPTER,
SHOWNON FEFRACTORTELESCOPE,
AVAILABLE FROI\,iYOUR DEALER.
ASK
FOR
#1601.
I
CARE
ANDUSEOF
TELESCOPE
LENSES
IHE OBJECTIVE
LENS
Theobiecl ensof your loTE5 ToscoTeescope
hosbeen
veryhighlypollshedondsround
rominule
role.d..es.lt must be.eoned os corefu
1y
ond os
rorelyos posible to ovoidolfectingirsoccurocyond
per{ormonce.The lenses
mustneverbe token out ot
iheirmou.i by oi inexperienced
person.NOTE,I
rhe
'tqlorjng on" odusiment{rews ore over
tighi
ened,ihe enses
moybe putunder
q siroi. to mor
CLEANING THE LENSES
When r becomesnecessory
io cleon ihe lenses,
fiEi removelhe dusr
with o ccmelholrbrush
or
eo' type syrlnge.Ploceo few drops
of etheror Plre
groin
olcohol
on o pieceo{ cleon
corron
thor hos
YOUR ldsco GUARANTEE
AllTASCotelescopes
heartheTAsc0
SealolApproval,
whichis yourguarantee
thatthey
atefreeol any
defects
in r€gardsto nalerial!sed,
as{elt aswofkm,nship.
Sholldany
TASCotelescope
prove
lo bedelective
byteason
0f naterialorworknanship,il willherapairld
wilhout
charge0rreplaced.When
your
lelescope
isnot
inuse,alwayskeep
it protected.
Guar,ntce
is
ahaysvalid,
the
only
exceplionbeing
ifthetelescope
hesbeenabused,
0rtampercdf,ithi[ any
wat.
beenwoshed severol
rimesond wipe lhe lensesvery
9e1l
y.o,o
dn9 f- . r .ror
_ol,o_.8
owory 'en o 1
lng Inl or dusto1f
wlrh
on eorlypesyringe.
SUDDEN
TEI.I?ERATURECHANGES
t possible,
ovoid tokiig the teescope frofr cold
outsideor into Thiswll couse
the
obective leis to become covered wih .ondensed
noislure,
o condirion
whichmust
becorected ot once.
Todo this,
plocethe oblectivelensot o soledisionce
{romo heotsourceond ei il wormslowy uniillhe
moisiuredisoppeda. Any stoins Lell on rhe enses
must be corefu
ly wiped ofl otler the Lensesore
Set up the teles.opeouldo6 in cod weolher ot
leostone hoI hourbe{oreuse.
tasco sALEs,rNc.. MrAMr,FLoRTDA