Physics Instruments

Optically worked faces, ground edges, white glass, well polished size 50x45mm.
Cat. No. 1413/1 Plano Convex.
Focal Length 6cm Focal Length 7.5cm
Focal Length 10cm Focal Length 15cm
Cat. No. 1413/B Plano Concave.
Focal Length 6cm Focal Length 15cm
Focal Length 30cm
Cat. No. 14131/C Bi-Convex.
Focal Length 7.5cm Focal Length 15cm
Focal Length 20cm
Cat. No. 1413/D Bi-Concave.
Focal Length 7cm Focal Length 15cm
Focal Length 20cm

Clear acrylic plastic blocks 20mm thick with bottom surface finished in white to show ray tracks and all other surfaces fully polished. Comprising of seven blocks, Rectangle 75x75mm, Triangle 90x45x45, 75mm hypotenuse, Triangle 60x60x60, 57mm side, Semi-circle 75mm dia, Biconvex 75mm long curved faces, 115mm radius, Bi-convex 75mm long curved faces, 145mm radius, Bi-concave 75mm long curved faces, 115mm radius

For the rapid examination of spectral composition of white light, metal tube with draw out focusing and an adjustable slit fitted with achromatic objective glass and 3 element Prism. Complete in wooden box.

Coloured, gelatine film, 50mm square card mounted A Red B Green C Deep Blue D Compound Yellow E Magenta F Peacock Blue G Deep Red H Orange Red I Yellow Green J Pure Green K Blue Green

Un-mounted acetate sheet, size 75x50mm, comprising three primaries and three secondary colours. Set of 6

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For demonstrating the principle that the pressure increased with depth. Made of stout tin sheet having three orifices of the same size but at different heights down one side. Size of cylinder 400x68mm

Visualising random motion in gases is a difficult concept to imagine. This Kinetic Theory apparatus enables students to see this phenomena. In a clear plexi glass quantitive demonstration. It demonstrates Kinetic Theory of Gases, variable speed, low voltage 6V D.C. dimensions 160x130x310mm (approx)

1 Made of corning glass
2 As above but Neutral glass

For demonstrating the relationship between capillary pressure and the bore diameter of the capillary tube. The apparatus comprises a metal frame, the base of which takes the form of a trough 115x40x10mm. The upper part of the frame supports six capillary tubes, each of a different bore, their lower ends resting in the bottom trough. When trough is filled with water the difference in heights of the resulting columns of water in the tubes is readily apparent. Overall height of frame 90mm. Length of capillary tubes 150mm.

Two heavy walled glass cylinders 40mm and 15mm inner dia, respectively both fitted with non-return valves, and pistons, pump worked by hand lever 31.5cm long ratio about 2:1 safety valve provided in the large piston so that pressure in excess of that which can safely be applied to the glass cylinder enables the water to rise above the piston and escape through the overflow pipe at the top; stopcock at the base of the small cylinder for replenishing cylinders with water by rubber tubing from beaker of water. Removable loading platform: wedges for breaking metal bars. Strongly constructed and mounted on base board 29x19cm complete.

Comprises of two brass cylinders of different diameter fitted with pistons and connected by a brass tube. Mounted on wooden base.

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Green background board is securely fixed in aluminum frame with hanging hooks on end.

Cat. No.	Size
1)	45 x 30 cms
2)	60 x 45 cms
3)	90 x 60 cms
4)	120 x 45 cms
5)	120 x 90 cms
6)	120 x 120 cms
7)	150 x 90 cms
8)	180 x 90 cms
9)	180 x 120 cms

Wooden make, superior quality.

The air track may be used to perform numerous experiments easily and accurately with almost the total absence of friction errors. Topics such as frictionless motion, elastic and inelastics collisions, and the concepts of velocity, acceleration, conversation of momentum etc. can be dealt with. Along anodized aluminium track of special shape and propartion is mounted and aligned on a sturdy base. Various gliders, which float to and fro on the air cushion, together with a large number of attachment are provided to cover the largest range of experiments. Track and attachments are packed in kit form complete with operating instructions. The air track comes complete with blower, hose, adaptor and mains lead.

This apparatus consists of a solenoid (for prompt release of the sphere on being disconnected) and gate switch unit mounted on a base, which is clamped on a 12mm dia. retort stand rod. Connections are made through 4mm sockets. The gate switch unit consists of a hinged metal plate held against an adjustable contact by means of small permanent magnet so that by proper adjustment, the plate falls promptly at the impact of the falling sphere. Centisecond timer can be used with this apparatus.