What are Optical Benches

Optical Benches Are Very Versatile Instruments With Wide Applications In Research And Educational Laboratories , Industry & Inspection Departments. Some Important Applications Are :
* Checking Various Parameters Like Focal Length , Abberations Etc. Of Lenses , Mirrors And Optical Systems.
* For Teaching, Demonstration And Instruction Of Various Optical Principles.
* For Setting Up Various Experiments Of Light Level Measurement & Comparison , Interference ( By Fresnels Biprism And Various Other Methods) And Diffraction.
* It Is Used For Alignment And Positioning By Means Of Linear / Rotational Movement Of Various Components , Telescopes, Collomators , Light Source Etc. In Many Laboratory Experiments .

Optical Bench
" Sales Code POPT100"

Simple Pattern,Comprising Wooden Base With 1 Meter Scale Graduated In Mm Fixed Along The Front Edge.Complete With 2 Lens Holders, One Candle Holder,Pin Holder,Wire Gauge Screen , Ground Glass Screen,Prism Table And One Needle With Index Marked.

Optical Bench , Research
" Sales Code POPT101"
It Consists Of 170/200 Cm Long Lathe Bed Type Bench Made Of Aged Rugged , Well Ribbed & Strain Relieved Special Grase Close Grain Iron Casting. The Vee And Flat Ways Are Precision Ground For Straightness.Four Levelling Screws With Footplates Are Provided .The Scale For Determining The Position.The Scale For Determining The Position Of The Carriages Is Graduated Every 1 Mmon A Precision Dividing Machine.The Bench Is Recommended For Precision Measurements.

Senior Optical Bench
" Sales Code POPT102"

It Consists Of Two Steel Rods Supported On Heavy Cast Iron Feet With Levelling Screws.The Horizontal Rods Are Made Of Cold Rolled Steel On Which Close Tolerance Are Maintained For Straightness .It Is 150 Cm Long Heavily Nickel Plated With Graduation In Mm.

FOR above Senior Optical Bench

Carriage :
" Sales Code POPT103"
Each Carriage Is Precision Machined And Assembled For Smooth Sliding Motion And Freedom From Tilt.The Reamed Hole Dia 12.7 Mm Of The Vertical Pillar Is Perpendicular To The Plane Of The Bed.The Carriages Made Of Well Seasoned Cast Iron Have A Spring Loaded Clamping Arrangement So That They Do Not Shift When Clamped In Position . A Vernier Reading To 0.1 Mm Is Provided.

X-Y-Z Carriage :
" Sales Code POPT104"
This Carriage Has The Provision To Translate Upto 25mm In X And Y Directions With Two Precision Micrometers Lc 0.01 Mm.A Large Knurled Nut Is Provided For Vertical Z Motion Upto 40 Mm With A Least Count Of 0.1 Mm.

X-Y-Z And Rotation Carriage :
" Sales Code POPT105"
This Has An Additional Rotational Movement. Than X-Y-Z Carriage. Nodal Slider : It Is Used For Measurements Of Focal Points , Abberrations Etc. Linear As Well As Rotary Movement Is Provided .Any Lens Holder Of 'Bpi' May Be Used With It.

Focometer Bench
" Sales Code POPT106"
: Complete With Standard Accessories , Collimator , Microscope & Slides Etc. It Can Measure Focal Length From -1200 To 1600 Mm. It Is Most Suitable For Research And Testing Laboratories For Focal Length Measurement , Checking Of Resolving Power , Abberrations And Other Parameters.

Light Transmission Measurement Bench
" Sales Code POPT107"
: Complete With Collomator ( 150 Mm F.L. & 48 Mm Clear Aperture ) , Iris Diaphragm ( ( 2 - 20 Mm And 2 - 50 Mm ) Light Source With Condenser , Set Of Interference Filters Covering Visible And Near Ir Range , Photodetector , Microprocessor Based Digital Meter Giving Reading Directly In Terms Of Percentage .

Saddle :
" Sales Code POPT108"
These Saddles Are Made Of Seasoned Cast Iron.The Vertical Pillar Is 6 Cm Long With A Internal Diameter Of 12.7 Mm.
Saddle : It Has The Provision For Transverse Motion. Rest Same As Above.
A ) Double Rod Lens Holders : For Lenses Upto 62 Mm Diameter.
B ) Spring Lens Holders : For Lenses Upto 50 Mm Diameter.
C ) Universal Lens Holders : For Round And Squar Optical Components Upto 60 Mm Dia Or Width. The Components Is Held By 3 Jaws At 90 Deg To Each Other. A Provision For Coarse And Fine Rotation Of The Component Is Provided.
D ) Self Centering Lens Holder : For Lenses Upto 50 Mm Diameter. A Lever Is Provided To Give Smooth Motion To Three Spring Loaded Arms.
E ) Adjustable Double Lens Holder : It Can Hold Two Lenses Of Dia Upto 60 Mm , The Distance Between The Lenses Can Be Adjusted With A Rack And Pinion Arrangement.

Adjustable Slits :
" Sales Code POPT109"
These Are Used To Control The Light From Its Sources In A Wide Variety Of Applications,Ultra Fine Adjustment Of Light Line Can Be Made In Knurled Knob.The Parallel Knife Edge Jaws Move In Dovetailed Guides.The Slits Have An Aperture Of 6 Mm.

A ) Simple Slit ( German Silver ):
B ) Standard Slit ( Stainless Steel ):
C ) Micrometer Slit : Stainless Steel, With Micro Meter Reading To 0.01 Mm
D ) Both Jaws Moving Slit : Made Of Stainless Steel .Provided With A Knurled Ring To Move Both Jaws Simultaneously.This Slit Is Very Useful Since The Alignment Of The Slit Is Not Disturbed.

Micro Meter Eye Pieces :
" Sales Code POPT110"
Used On Optical Bench To Measure Small Distances Between Images , Fringe Width And A Wide Variety Of Other Applications . A Lead Screw Of ½ Mm Pitch Is Provided Have 8x Magnification .The Micro Meter Drum Is Divided In 50/100 Parts.

Micro Meter Eye Pieces,Standard ( L C 0.005 Mm ) :
" Sales Code POPT111"
The Carriage For Moving The Cross Line Moves In Accurate Guides And Has A Traverse Of 20 Mm.The Complete Mechanism Is Enclosed In A Aluminium Cast Body.

Micro Meter Eye Pieces,Precision ( L C 0.005 Mm ) :
" Sales Code POPT112"
A Brass Slide Houses The Eye Piece Assembly And Reticle.The Slide Moves In A Seasoned C.I. Guide.

Micro Meter Eye Pieces,Simple ( L C 0.01 Mm ) :
" Sales Code POPT113"
A Brass Slide Housing The Eyepiece And Reticle Assembly Moves In An Aluminium Guide.

Ramsden Eyepiece ( Mag.8xdia , 19 Mm )
" Sales Code POPT114"
Iris Diaphragms And Pin Holes : Iris Diaphragm From 2 To 20/50 Mm. Set Of Pin Holes Of 0.1 Mm , 0.3 Mm , 0.5 Mm & 1 Mm.

Photo Meters :
" Sales Code POPT115"
They Are Used For Visual Comparison Of Light Intensities.The Photo Meters Are Mounted On A 12.7 Mm Rod And Are Suitable For Use On ' Bpi Optical Benches.
A ) Bunsen Grease Spot Photo Meter :
B ) Lummer-Brodhum Photo Meter : The Complete Prism Assembly Is Mounted In A Metal Case .The Illuminating Power Of Two Light Sources Can Be Compared With The Help Of A Sighting Telescope.
C ) Jolly's Photo Meter : It Consists Of A Two Piece Polythene Block 25 Mm Squar , 10 Mm Thick Fitted On A Wooden Stand . A 12 Mm Aperture Is Provided.

Accessories For Interference Experiments :
With The Help Of These Accessories We Can Measure The Wave Length Of Light By Making Measurements Of Interference Fringes.
A ) Young's Double Slit : It Comprises Of A Double Slit 10 Mm .Long With 1 Mm Separation Housed In A Frame . A Screw Is Provided For Fine Adjustment In The Vertical Plane.
B ) Fresnel's Bi-Prism : The Bi-Prism Has An Included Angle Of 178 Deg.
C ) Lloyd's Mirror : Used On A Optical Bench To Reflect The Incident Beam Which Produces Interference Fringes With Undeviated Beam Of Light From The Same Source.
D ) Fresnel,S Double Mirror : A Single Beam Of Light Is Reflected From Two Mirrors And Interference Fringes Are Produced Between Them.


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Ray Box
" Sales Code POPT116"
An Economical Multi Purpose Light Source For Work In Elementary Optics.It Consists Of A Lamp Housing ( 12v , 24w Lamp ) 150 X 70 X 65 Mm, A Bi-Convex Cylindrical Lens ( 50 X 50 Mm,F.L. 75 Mm )And A Slit Plate ( Single And Triple Slits ) Whitened On One Side.The Lamp Housing Has An Open Front And Vertical Internal Slots To Accommodate Various Comonets And Get Parallel, Convergent Or Divergent Beam When A Cylindrical Lens And A Slit Plate Is Used.
Accessories : Cylindrical Biconvex Lens ( 50 X 50 Mm) F.L.75 Mm. .....................:Cylindrical Lens Set ( One Each Plano-Convex Lens,F.L.150mm And Plano Concave Lens F.L. 300 Mm )
.....................: Transformer Input 220v Ac Output 12v : Set Of Seven Mounted Colour Filters .

Ray Box Set
" Sales Code POPT117"
An Economical Solution Which Provides A Complete System Which Allows To Perform Experiments Such As Refraction, Reflection, Focal Length Determination And Colour Mixing . The Well-Ventilated Light Box Incorporates An Adjustable Lens Which Enables Converging Parallel And Diverging Rays To Be Produced.At The Ends And Sides,Vertical Grooves Are Provided For Inserting Slit Plates And Colour Mixing To Be Carried Out Between Front & Side Beams.The Light Source Is A 12v,24w Dbc Axial Filament Lamp Fitted With Approx.1 M Long Lead Terminating In Two 4 Mm Plugs.Complete With Optical
Accessories Semi-Circular Block , Concave Lens , Convex Lens , Trapezoidal Block , Right Angled ( 45° ) Prism , Two Slit Plates , Plane Mirror , Parabolic Mirror , Cylindrical Mirror , Set Of Coloured Cards , Set Of Mounted Colour Filters. Transformer With On/Off Switch , Main Lead , Out Put Terminals. Input 220v,50hz Out Put 12v, 24w .

Ray Track Apparatus
" Sales Code POPT118"

A Compact Visual Teaching Aid Which Is Robustly Constructed And Easy To Use It Is An Ideal System For The Demonstration Of A Wide Range Of Ray Optic Experiments Including Laws Of Refraction , Focal Length Combination , Principles Of Telescopes And Microscopes And Defects In Mirrors And Lenses. The Base Consists Of A Wooden Board 400 X 280 X 120 Mm With White Matt Surface , Carring A Circular Scale Divided Into Four Quadrants Each 0-90° Graduated At Every 2° , A Removable Turn Table 170 Mm Diameter With Two Lines At Right Angles And A Ray Box. Supplied Complete With One Cylindrical Biconvex Lens ( F.L. 75 Mm ) And Two Slit Plates Having One Wide Slit And One Each Single,Three And Five Narrow Slits .
Accessories : Mirror Set Of Three With Holders.
.................... : Acrylic Optical Blocks.
.................... : Power Supply.

Light Box And Optical Set
" Sales Code POPT119"

This Kit Is Very Useful For Reflection , Refraction , And Colour Mixing Experiments. The Light Box Consists Of A Light Source ( 12v , 24 W Lamp ), Producing Convergent, Divergent Or Parallel Beam. On One End, An Adjustable Cylindrical Convex Lens ( For Parallel Beam ) And On The Other End , A Triple Aperture System For Colour Mixing Experiments ( Lateral Aperture Are Provided With Adjustable Hinged Mirror ). All Apertures In The Box Are Provided With Vertical Channels To Hold Slit Plates And Colour Filters.
The Optical Set Includes:
Acrylic Blocks 10 Nos , Set Of Three Mirror , 2 Slit Black Plates , One With Three Narrow Slits At One End And One Narrow Slit At The Other End. Another Black Plate With Four Narrow Slits At One End,One Wide Slit At The Other End & Set Of Seven Mounted Colour Filters.



Ray Optics Kit
" Sales Code POPT120"
To Investigate The Properties Of Lenses And To Construct Simple Optical Instrument. Comprises Of 2 Lamp Holders Each In Metal Shade With 2 Axial Slots,Shade Has Integral Support Arm Which Is Clamped At Right Angles To A Vertical Rod,Height 165 Mm , Held In A Heavy Cast Metal Base .Holder Complete With 2 Meter Of 2-Core Cable And 12v ,24w Axial Filament Lamp.Cable Is Led Through Hole In Support Arm And Securely Clamped, Base Is Recessed To Accommodate Lamp So That The Shade May Be Lowered On To Base When Not In Use .One Each Right And Left Hand Cylindrical Lamp Shields In Matt Black Finish,Light Alloy Sheet With Slot Parallel To Axis.
Overall Size 190 X 60 Mm ( H X I.D. ) . Two Black Plastic ' Combs ' 100 X 80 Mm With 17 Equispaced Parallel Slots 45 X 1.5 Mm ( H X W ) , 2 Combs And Plate Holder , 2 Spring Clips Mounted On Matt Black Finish Metal Support Bracket , 4 Black Finish Metal Light Barriers Height 180 Mm , 4 Plano-Convex Cylindrical Lenses 50 X 50 Mm ( Side X Height ) + 7d, 2 Each Cylindrical Lenses 50 X 50 Mm ( Side X Height ) , Plano-Convex +10d , +17d , Plano-Concave -17d .

Optics Kit
" Sales Code POPT121"
For Class Work On Diffraction And Interference Of Light ,And Aberration Of Lenses.
The Kit Comprises: Description Quantity
Plano-Convex Lenses,Focal Length 500 Mm 8 Pcs
Plano-Convex Lenses , Focal Length 150 Mm 1 Pcs
Universal Holders 18 Pcs
Plates With Circular Apertures 22, 11 And 5.5 Dia 3 Pcs
Plates With Small Holes Set On Circles 29 , 22 & 10 Mm ,Dia To Select Annular Zones 3 Pcs
Multiple Aperture Plates To Give Any Four Different Small Apertures 4 Pcs
Transluscent Screens 6 Pcs
White Cards 10 Pcs
Eye Pieces 4 Pcs
Each Red,Green And Blue Filters 15 Pcs
Black Cards With Holes 40 Pcs
Rubber Bands 120 Pcs
Piece Of Black Chiffon To Show Diffraction Effect 1 Pcs

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Pin Hole Camera
" Sales Code POPT122"

For Demonstrating Various Class Experiments Related To Pin Hole Camera.Comprises Of 8 Preformed Black Card Board Camera Boxes With Outer Sleeves, 3 Sheets Of Translucent Paper 20 X 33 Cm , 50 Sheets Light Proof Black Paper 20 X 25 Cm , 1 Lamp 230v-200w , 1 Lamp Holder With Leads , 1 Box Of Assorted Steel Pins, 1 Reel Of Cellulose Tape. Assembled Box Measure 15 X 10 X 10 Cm And Each Has A Circular Hole,3.8 Cm Diameter At One End And A Hole 6.4 Cm Square At The Other .The Latter Is Closed By Means Of The Translucent Sheet.

Parallel Beam Projector
" Sales Code POPT123"
It Produces A Light Beam Which Is Continously Adjustable To Either The Parallel Or Divergent Or Convergent Beam.The Apparatus Consists Of A Sheet Metal Case 32 X 7.5 X 10 Cm ( L X H X W ) .A Plano-Convex Lens Of 5 Cm Dia And 15 Cm F.L. Is Held In Position By Three Screws Inset 7.5 Cm From One End .A Covered Prism Table Is Set In Front Of The Lens.A 12v Lamp Fitted In The Holder And Placed Behind The Lens Can Be Easily Moved Upto 15 Cm For Focusing. Lamp Mounting Is Enclosed To Avoid Light Coming Out Of The Case ,With 1 Meter Two Core Cable Lamp And Prism .

Pins , Optics
" Sales Code POPT124"
For Optical Experiments , Avalable In 50 Mm Length In Plated Brass And Iron.

Pins , Optics
" Sales Code POPT125"
For Optical Experiments , Avalable In 75 Mm Length In Plated Brass And Iron.

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Rotatable Optical Disc, Hartley's
" Sales Code POPT126"
A 500 Mm Diameter White Painted Steel Disc Marked At Every 5°,With Cross Lines At 90° And A Centre Mark On A Stable Cast Iron Base.The Main Disc And The Lamp House ( With 12v , 24w Bulb ) Can Be Rotated And Held In Any Desired Position With The Lamp House , A Rotatable Disc With Single , Double , Triple & Quadruple Slits And With Adjustable Lens Carrier With Lens ( For Divergent , Parallel Or Convergent Light Beams ) Is Provided.This Assembly Is Mounted On A Rotable Arm,Counterpoised By A Heavy Weight.
Optical Elements Provided For Reflection , 50 X 25 Mm Plane Glass Mirror And A Polished Plated Metal Cylindrical Mirror .For Refraction,Semi Circular , Biconvex , Biconcave , Trapezoidal & Right Angle Prism Acrylic Blocks.All These Have Powerful Magnets For Fixing Of Blocks To The Disc .

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Mirrors , Glass , Spherical ,Concave
" Sales Code POPT127"
Optically True , Highly Silvered.
Diameter , Mm: 50 60 75 100 150
Focal Length,Mm: 100 , 150 , 200 , 300 In All Diameter.  

Mirrors , Glass , Spherical ,Convex
" Sales Code POPT128"
Optically True , Highly Silvered.
Diameter , Mm: 50 60 75 100 150
Focal Length,Mm: 100 , 150 , 200 , 300 In All Diameter .

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Mirrors , Glass , Strips

" Sales Code POPT129"
With Copper Back Silvered.
Dimensions , Mm : 100 X 25
..............................75 X 50
............................100 X 50
............................100 X 75

Mirror Strip Holder
" Sales Code POPT130"

Woodn Cube Shaped Side 50 Mm.

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Bi-Concave Lenses
" Sales Code POPT131"

Spherical Double Concave Lens , Highly Polished.
Diameter , Mm : 38 50 75 100
Focal Length ,Mm: 50 , 100 , 150 , 200 , 250 , 300 , 400 , 500 & 1000 .

Bi-Convex Lenses
" Sales Code POPT132"

Spherical Double Convex Lens , Highly Polished.
Diameter , Mm : 38 50 75 100
Focal Length ,Mm: 50 , 100 , 150 , 200 , 250 , 300 , 400 , 500 & 1000 .

Lenses , Set Of Six
" Sales Code POPT133"
Sizes In 38 Mm & 50 Mm. Consists Of
One Each:- Bi-Convex , Bi-Concave , Plano Convex , Plano Concave & 2 Concave - Convex In Velvet Lined Box.

Lens Holder
" Sales Code POPT134"

Wooden With V-Slot To Hold Lenses.

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Rectangular Glass Slab
" Sales Code POPT135"

Opticaly True.
Size : 75 X 50 X 18 Mm
........100 X 50 X 18 Mm
........125 X 65 X 18 Mm

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Prisms , Glass , Right Angle
" Sales Code POPT136"
Clear , Boubble Less Glass.
Size , Mm :- 25 , 38 & 50.

Prisms , Glass , Equilateral
" Sales Code POPT137"
Clear , Boubble Less Glass.
Size , Mm :- 25 , 38 & 50.

Prisms , Hollow ,Glass
" Sales Code POPT138"
Size , Mm :- 38 & 50.

Prisms Optically Worked , Glass
" Sales Code POPT139"
Equilateral, For Spectrometer Work.
Sizes : 25 X 25 Mm,Ht ; 32 X 32 Mm,Ht ; 38 X 38 Mm,Ht
Available In : Crown Glass.
..................... Light Flint Glass.
..................... Dens Flint Glass.
..................... Extra Dens Flint Glass.

Prisms , Acrylic
" Sales Code POPT140"
90-45-45 Deg .......Size: 108 X 76 X 76 Mm
90-60-60 Deg .......Size: 127 X 14 X 63.5 Mm
60-60-60 Deg .......Size: 76 X 76 X 76 Mm .

Acrylic Plastic Optical Blocks
" Sales Code POPT141"
For Refraction Experiments And Also Used With Ray Track Apparatus,Hartley's Optical Disc & Light Box.
Consists Of :-Rectangular Block
.....................-Semicircular Block 50 Mm Radius
.....................-Biconvex Block 180 Mm Radius
.....................-Biconvex Block 100 Mm Radius
.....................-Biconcave Block 180 Mm Radius
.....................-Biconcave Block 100 Mm Radius
.....................-Trapezoidal Block,With 60 & 45 Degree Angles Prism
..................... .Blocks .

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Spherometer
" Sales Code POPT142"
Brass Dial Head 40 Mm Dia With Stainless Steel Screw 0.5 Mm Or 0.1 Mm Pitch. Head Divided In 100 Divisions Reading To 0.01 Mm Or 0.05 Mm And Registering On Vertical Scale 10-0-10 Mm Frame With Feet Of Stainless Steel On P.C.D. Of 46 Mm Separation Approx 40 Mm. Zero Adjustment Can Be Done By Unscrewing Thumb Screw .

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Spectrometer , Student, 0.1 Degree Of Arc
" Sales Code POPT143"

Stable Cast Body Integral With Collimator Tube Support.The Collomator And Telescope Have 170 Mm Focal Length And 25 Mm Clear Aperture Object Glass.The Collimator Has A Precision Slit And Telescope 8x Ramsden's Eye-Piece On The Other Ends .Focussing Is Done By Helical Action Device.The Scale ,175 Mm In Dia ,Is Divided In Degrees And Is Read To 0.1 Degree ( 6 Minutes ) With The Help Of A Vernier Fixed To The Telescope Arm .The Scale Can Be Rotated Through 180° And Locked In Any Desired Position.The Telescope Has Both The Coarse And Fine Adjustment For Exact Reading ,Adjustable Holders .Prism Holders Accomodates Prism Upto 38 Mm High .Supplied With Prism Holder ,Grating Holder And Tommy Bar For Adjusting Optical Axis.

Spectrometer , Advanced
" Sales Code POPT144"

It Has A Stable Cast Iron Body With Levelling Screws And Protected Circular Scale Of 150 Mm Dia,Read By Two Opposite Verniers To One Minute Of An Arc.Telescope And Table Have Fine Adjustment Screws.Coarse Motion Can Be Made By Releasing The Clamping Screws.The Collimator And Telescope Have 175 Mm Focal Length And 25 Mm Clear Aperture Object Glass.The Collimator Has An Adjustable Slit And Telescope Has 8x Ramsden's Eye-Piece On The The Other End.Focussing Is Done By Rack And Pinion Device.Prism Table Is Marked With Lines To Assist Placing The Prism With Respect To The Table Levelling Screws And Has Screwed Holes For Fixing Prism And Grating Holders.Prism Holders Accomodates Prism Upto 38 Mm High.Supplied With Prism Holder , Grating Holder , Magnifier Glass , Tommy Bar For Adjusting Optical Axis.

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Micrometer Sextant
" Sales Code POPT145"
This Precision Built Instrument Is Used For Measuring Altitudes And Angles.It Is An Essential Part Of Ships Navigational Equipments And Is Also Used In Training And Educational Institutes.The Frame Is Of A Rigid Metal Construction And Incorporates Three Legs Upon Which Sextant Rests When In Horizontal Position.On The Arc A German Silver Scale Is Inlaid Which Is Graduated From -5 Deg To 120 Deg With A Smallest Division Of 1 Deg.The Worm And Rack Are Made On A Precision Machine With Utmost Care. The Micrometer Drum Reads To 12 Seconds.Index Mirror, Horizon Mirror And Set Of Filters Of High Quality Are Provided.The Sextant Is Supplied Complete With A Galilean ( Errect Image ) Telescope And An Astronomical ( Inverted Image ) Telescope .

Sextant Stand
" Sales Code POPT146"
Used To Hold Sextant In Horizontal & Vertical Positions.It Consists Of A Firm Gripping Clamp & A Heavy Tripod Base With Three Levelling Screws. Height Adjustable From 118 Cm To 175 Cm.

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Standard Reading Telescope
" Sales Code POPT147"
The Telescope Is Mounted On A Specially Designed Carriage With Support Ring To Stop Abrupt Falling.The Carriage Is Fitted With Two Adjustable Screws For Precise Vertical And Horizontal Positioning On A 25 Mm Dia,450 Mm Long Steel Pillar,Fitted On A Cast Iron Base With Levelling Screws.A Scale Holder Is Provided.
Fitted With An Achromatic Objective Of Focal Length. 178 Mm, Clear Aperture 23 Mm And 8x Ramsden Eye Piece With A 90 Deg . Cross Line Reticle.The Focussing Is Done By Rack And Pinion Mechanism ,With A Range From 1000 Mm To Infinity .

Scale For Reading Telescope
" Sales Code POPT148"
Made Of Milky White Plastic Sheet Fitted In A Frame , Length 50 Cms. Division Numbered 25-0-25 And 0-50 Sm , Inverted Figures.

Simple Reading Telescope
" Sales Code POPT149"
The Telescope Is Fitted On A Unversal Clamp Which Can Be Moved On A Steel Pillar Of 12.7 Mm Dia And 500 Mm Long Fitted On A Heavy Tripod Base. Fitted With An Achromatic Objective Of Focal Length. 178 Mm, Clear Aperture 23 Mm And 8x Ramsden Eye Piece With A 90 Deg . Cross Line Reticle.The Focussing Is Done By Rack And Pinion Mechanism ,With A Range From 1000 Mm To Infinity .

Telescope Galilean (Errect) Astronomical (Inverted)
" Sales Code POPT150"
Clear Aperture Of Og 32 Mm 22 Mm
Focal Length Of Og 100 Mm 150 Mm
Magnification 2.5 X 5x
Reticle None 90 Deg Cross