Clear glass, ground edges.

Clear glass, ground edges.

Glass, one each double convex, plano-convex, concavo-convex, convexo-concave, plano-concave and double concave lens, in box.

Consists of a robust light box in matt black finish with a 12 V 24 W axial filament lamp with flexible leads. One end of the box takes a cylindrical convex lens in an adjustable sliding mount to enable production of convergent, parallel or divergent beams. The other end of the box has a triple aperture system for colour mixing experiments. The two side apertures are provided with hinged mirrors. All apertures are provided with vertical channels to hold slit plates and/ or colour filters.

Fitted in plastic frame, superior quality

A: Single 4x

B: Double 7x

C: Triple 10x

D: Gowland type Plano-convex lens of extra white glass. Unbreakable plastic lens holder and aluminium anodized cover Magnification 10x.

E: Single, diameter 40 mm, magnification 3.5x.

In metal frame with black plastic/bakelite handle.

Rectangular, glass, back silvered, with protective coating, pack of 10.

For demonstrating that white light may be composed from all the spectral colours by rotation of multi-colored disc. Comprising a multi-coloured metal disc 150mm. diameter mounted on metal stand and driven by belt with the help of driving wheel, fitted with a handle, individually packed.

As above, with coloured disc 150mm dia & mounted on light metal base for schools.

One metre long, single square steel rod accurately graduated fitted on two sturdy metal feet with levelliing screws. Four special designed heavy sliders having fine index marks. Two of the sliders are having fine transverse slow motion arrangement. Complete with four accessories(two lens holders and two optical pins).

Bench has two steel rods, one of which is graduated in mms. with heavy metal end supports with levelling screws with four metal slides which slide smoothly on the bench.Two of the slides have transverse motion arrangement. Complete with two lens holders and two object needles.

A wooden base board with one meter scale divided into mms. with following accessories .:

1 each White face object & receiving screens each 150x100 mm,with aperture, mounted on wooden base with an index mark.

1 Plane mirror 150 x 100 mm mounted as above

1 Lens holder V shaped , wooden.

1 Needle vertically mounted in a short wooden rod, on base.

1 Candle holder on base.

The components have the same optical centre height.

A 500 mm diam. disc marked every 5° is mounted on a heavy stand and is rotatable around its centre. It can be held in any desired position. The lamphouse, with a 12V 24 W special filament lamp has rotatable slots to provide light beams of varying widths & also narrow single, double & triple beams. Attached to the lamp house is an adjustable lens carrier with lens to provide diverging, parallel or converging light beams which are clearly visible in classroom. The lamphouse can be held in any desired position around the disc.

Optical elements are two 50 x 25 mm plane glass mirrors, and a metallic cylindrical mirror, each mounted in a holder, for reflection. For refraction, 20 mm thick acrylic semi-circular block, bi-convex lens, bi-concave lens each 140 mm long & a trapezium with 125 mm base are provided. Each of these elements has embedded magnets to hold on to the disc.

To show principle of reflection, with two plane mirrors fixed at 45°, overall size 250 x 45 x 45 mm, polished wood.

Consists of:
8 Plano-convex lens fl 500mm,
1 Plano-convex lens of fl 150mm
12 Lens holders
4 Plates of different apertures,32,22,11 & 5.5mm diam.resp.
3 Plates with small holes in circles of 29,22,10 mm diam.
1 Plate with circular aperture of 5.5 mm diam.
4 Multi-aperture plates
4 Stop plates
2 Slide holders
6 Translucent screens,
10 White cards
4 Eye-pieces
15 each Red,green and blue filters
40 Black cards with holes
40 Razor blades
120 Rubber bands
1 Piece black chiffon for diffraction effects

From ordinary glass plates properly cemented with optical cement. Available in different sizes.

A. Non-optically worked, with polished faces, edges slightly bevelled. Nominal angles 60 x 60 x 60 Deg.

B. Right angled. Non-optically worked with polished faces, edges slightly bevelled, Nominal angles 90 x 45 x 45 Deg.

Provide a simple means of producing single or multiple rays of light for use in elementary optics. Made of die-cast alloy, the raybox has an open front and vertical internal grooves to accommodate a slit plate and a cylindrical lens. Supplied complete with a metal plate having single and triple slits, a 12 V 24 W SBC line filament lamp and a lampholder.

Glass, Biconvex, Focal length approx. 15cm.(+14D).

These are fitted with an achromatic objective of F.L. 178mm, clear aperture 23mm 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 1000mm to infinity.

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. This arrangement is mounted on a 25mm dia, 450mm long steel pillar, fitted on a cast iron base with levelling screws. A scale holder is provided with scale.

This is a robust instrument designed specifically for student use which nevertheless is capable of very high performance. The main structure is of heavy cast metal, with bright plated fittings. The complete instrument is supplied with wooden case.

Specifications

Scale The 150mm diameter circle with protective plastic shield is fixed to the telescope movement and the table is attached to the double ended vernier which reads to 1 minute of arc. Both telescope and table rotation fine adjustment screws and release of a clamping screws enables adjustment of both movements to be made by hand.

Collimator Mounted on fixed and fitted with 178mm. focus achromatic objectives, 25mm clear aperture. Also fitted is a unilaterlly adjustable slit, 7mm long.

Telescope Mounted on moveable pillar and fitted with 178mm. Focus achromatic objective, 25mm, clear aperture. Also fitted is a 8x ramsden eyepiece and a glass crossline graticule. Both the telescope and collimator have rack and pinion focussing. Means are provided for levelling the axis of both optical units and for squaring them to axis of rotation.

Prism Table The table is marked with lines to assist placing the prism with respect to the table levelling screws.

Standard Accessories Supplied

1 prism clamp, 1 diffraction grating holder, 1 magnifier, 1 tommy bar for adjusting optical axis, 1 wooden case.

From ordinary glass plates properly cemented with optical cement.

Size 38 x 38 mm Hollow Prism

Size 50 x 50 mm Hollow Prism

Size 75 x 50 x 18 mm Hollow Slabs

Size 60 x 60 mm Hollow Truff

Size 75 x 75 mm Hollow Truff

A. Non-optically worked, with polished faces, edges slightly bevelled. Nominal angles 60 x 60 x 60 Deg.

B. Right angled. Non-optically worked with polished faces, edges slightly bevelled, Nominal angles 90 x 45 x 45 Deg.

Provide a simple means of producing single or multiple rays of light for use in elementary optics. Made of die-cast alloy, the raybox has an open front and vertical internal grooves to accommodate a slit plate and a cylindrical lens. Supplied complete with a metal plate having single and triple slits, a 12 V 24 W SBC line filament lamp and a lampholder.

Glass, Biconvex, Focal length approx. 15cm.(+14D).

These are fitted with an achromatic objective of F.L. 178mm, clear aperture 23mm 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 1000mm to infinity.

Optically worked for Spectrometer, Equilateral, two faces polished 32x32mm ht.

Prisms also available in sizes 25 x 25 mm and 38 x 38 mm.

Brass dial head about 40mm dia., divided in 100 parts registering on vertical scale 10-0-10mm, on metal black painted frame. Lead screw and three legs(40mm, separation) are of mild steel, legs are of stainless steel, disc type.