Physics Instruments

This is first quality, precision made jeweled movement watch in attractive chromium plated case. The face of the stop watch is transparent for easy reading of graduations and figures. It has an arrangement for the ‘start’ and ‘stop’ of the watch. There is a lever at the top of the body when this lever is pressed for the first time, the watch starts, when the same lever is pressed for the second time, the watch stops. A third press on the lever brings the watch to zero reading. This stop watch reads 1/ 10 th of a second. Least Count : 1 second

A cast iron base carries a vertical pillar terminating in a horizontal frame. A chrome plated steel wire is stretched across the frame. A light weight metal pointer approximately 200mm long with an adjustable counterpoise is attached to the centre of wire by means of a small clamp. A plastic scale is carried on the end of the arm extending from the torsion frame and is calibrated 5-0-5 cm. A small mass pan of40mm dia is attached to the pointer. The sensitivity of the balance is ultimately dependant upon the modulus of elasticity of the torsion wire and the wire supplied.

Complete with cross line graticule along with brass holder and eyepiece.

Superior quality 10 x ramsden eyepiece. Suitable for all PSAW reading telescopes.

Adjustment for resolving power of telescope. S.S. Adjustable slit with unilateral jaws movement through a micrometer head.

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For measuring the thickness of thin articles by optical method. Optical work 40 mm dia plain mirror mounted on a metallic arc. The arc is mounted on a aluminum metallic base with two fixed legs and one leveling screw.

Achromatic object glass focal length 178 cm and 25 mm clear aperture. 10 x ramsden eyepiece & focussing by rack and pinion (with up and down, to and fro motion) range from 1000 mm to infinity. Carriage for telescope with adjustable ring to stop adrupt falling, fitted with adjustable screws for precise vertical and horizontal positioning ; scale and scale holder are provided with stand, 25 mm dia steel pillar, 450 mm long fitted on a heavy cast iron base with three leveling screws. Both tubes of the telescope are of brass. Supplied with scale and scale holder and fitted with cross wire but without cross line graticule.

The superior quality achromatic, objective has an aperture of 25 mm and focal length of 17.5 cm. It contains a fine quality 10 x ramsden eyepiece and 900 cross line graticule. The working distance is adjustable by rack and pinion and the lens has focus from ‘0’ to infinity. The carriage of the telescope (with up and down motion, improved design,, college pattern) tube is fitted with vertical movement by a fine micrometer screw. Focussing arrangement is given by rack and pinion. Complete on a heavy metallic stand having pillar of 18” length. Both tubes telescopes are of brass metal. Supplied with scale and scale holder.

This is a good general purpose laboratory instrument. It employs an achromatic objective of 25 mm aperture and 17.5 cm focal length. The telescope is mounted on a sturdy stand with ½”steel C.P. rod, focus by smooth rack and pinion, 10 x ramsden eyepieces are used. Supplied with scale and scale holder. The sensitive focussing adjustment and wide range of working distance make this telescope a useful laboratory instrument.

A high class telescope for school students for all around purpose. It is light and easy to manipulate and has a high magnifying power. Overall length of astronomical telescope is 85 cm, fitted with high class achromatic objective of dia. 45 mm, focal length 22 “. Its high magnifying power provides extremely sharp images. The telescope is provided with an extra erector tube which can be screwed into the main tube after removing the eyepiece and this astronomical telescope is used as a terrestrial telescopes. Complete with velvet lined case. 1258 (a) Superior quality with high class achromatic objective 1258 (b) Regular quality

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Range	Grad	Length
0 to 50°C	1°	300mm
0 to 50°C	1/2°	300mm
- 10 to 110°C	1/2°	300mm
0 to 150°C	2°	300mm
0 to 120°C	1°	300mm

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Mercury in glass, with white enameled back. 5/7mm dia, with reinforced bulb.

Range	Grad	Subdivision	Length
0 to 50°C	1°	1	300mm
10 to 110°C	1°	0.1	300mm
10 to 110°C	1/2°	0.1	300mm
0 to 150°C	1°	1	300mm
0 to 200°C	1°	1	300mm
0 to 250°C	1°	1	300mm
0 to 300°C	1°	1	300mm
0 to 360°C	2°	2	300mm
0 to 400°C	2°	2	300mm
0 to 120°C	1°	1	300mm
0 to 220°C	1°	1	300mm
0 to 400°C	2°	2	300mm

Copper Constantan mounted on a superior quality wooden strip. With two terminals