Physics Instruments

For accurate measurement of focal length of lenses overall Length 1700mm, scale length 1500mm (graduated in mms)
Strong , inexpensive ,made to standardized specification with interchangeable parts the Twin bar optical Benches have won wide popularity because of the excellence and robustness of their design provide with 3rd supporting rod.
PSAW bench accessories. Standard accessories with PSAW optical bench.
i) Lens Holder -2 nos (ii) Needle --2nos

The bed is heavy cast iron with a strong control rib, throughly seasoned and aged before machining and griding of its upper surfaces. Total length 170cm. with a machined full length platform for the scale. The scale is from lifetime stainless steel fitted on its machined platform on the bed, Divided in mms to a length of 170cm. Accuracy of calibration 0.01 %

This pulley is specially designed for screwing to a parallelogram of Force Apparatus. This pulley will accept 25mm thick board.

This product is similar to the wa'lI type but is intended for use in laboratories where wall space is limited. At thick plywood pieces of thickness 12mm having dimension 45x30cm on a substantial wooden stand supplied with 2 sets of z-pulleys and 3 sets of (50 x 5gm) slotted weights but wlo cord.

For demonstrating the principles of parallelogram. The apparatus comprises a strong drawing board 45x30cm fitted with two hooks for fixing to a wall. The whole board is painted black. It is supplied with two nos. z-pulleys and 3 sets of iron c.P. slotted weights (SOx 5gm), but without cords.

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With hook for suspension. Available in three different sizes and six different metals.

Cat. No.	Metal Size 12 mm 18 mm 25 mm
1)	Brass
2)	Copper
3)	Aluminum
4)	Lead
5)	Zinc
6)	Iron

Comprising a solid turned different metals sphere with a small hook for suspension. Set of six different metals. The set consists one piece each of brass, aluminum, copper, zinc, iron and lead.
Three different size available are :

Cat. No.	Description
1)	12 mm
2)	18 mm
3)	25 mm

Brass with hole for thread

For electoscope, spare pack of 6

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Simple to use fitted with sensitive needle, which pivots on an axle and indicates on graduated scale when electrostatic charge applied to disc. Dimensions 95 x 60 x 105mm approx.

Comprising of 8 anisotropic alloy magnets; 8 anisotropic Ceramic Ferrite magnets: 4 steel magnetic yokes: 6 plotting compasses: 5 hardboard formers for compasses: 1 bottle iron filings: 4 each double C-cores, clips for C-cores, Aluminium rings, Split aluminium rings: 4 each support bases, armatures with axle rods, 8 split pins, 16 rivets, 1 length rubber tubing, 4 each formers of coils, reel of tape, reels white cotton, 4 each sheets white-paste board, plain postcards, reels white cotton, 4 each carbon resistors 100ohm, 10 ohm flash lamp bulb, 5 neon bulbs, 8 M.E.S> bulb holders, wood clamp and a wood block.

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For demonstrating the effect of electric discharge from points. The apparatus has a 60mm dia. Three-pointed star wheel with all the points curved in one direction. The wheel rotates freely on a pivot point mounted on a short stand and the stand is provided with a 4mm connection socket on its round moulded base.

To show that electrical charge resides on external surfaces of a conductor. Fabric net with cord on insulating pillar with metal base.

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For electroscope, assorted sizes. Pack of 10

A plated brass pillar mounted on plastic base supporting two pith balls in un-spun silk.