Physics Instruments

With 6- decades, four series dials for resistance 1,10,100,1000 ohms and 2 ratio dials . Two terminals are provided for using the series dials as on oedinary dial type resistance box . The galvanometer and battery key are fitted with contacts. Range od measurement is 0.001 ohms to 1,11 1000 ohms.Coils are nlon- inductively wound with constantan wire. Accuracy 0.2 % to 0.05%.

Ideal for Wheatstone Bridge and for working with Potentiometer, Bakelite moulded handle , brass plated contact and with a locating notch. A heavy lock type brass plated terminal is provided for connection with lead .The shape of the jockey is large (different from the one available i the market ) and easy to handle. Supplied without lead.

Specifications are same as that of cat. No. 1191B. Pencil jockey is replaced by heavy brass N.P. Spring type sliding jockey. Jockey slides on the metal rod within the due marks for scale reading. The jockey has 10 sharp pencil points, spring loaded contacts which can be used separately. The sliding contact key makes spring conact at any desired position. The design of the jockey permits high accuracy of reading and convenient position setting. This potentiometer is also supplied with pulley arrangement system to tight the wires. The ‘L’ shaped end connections are given on the strips which adjust both ends for faulty ‘0’ and end settings.

Other specifications are same as cat. no. 1191. Pencil jockey is replaced by spring type brass sliding jockey. This potentiometer is also provided with pulley arrangement system to tight the wires. The jockey moulded from brass alloy, sliding over the metallic rod provides maximum smooth movement. The jockey consist of four single sharp pencil springs loaded contacts are given separately. An overlapping perspex pointer helps in reading the raised scale.

Comprising four constantan wires of 24 SWG one meter long, clamped under heavy copper strips of SWG 18 and fitted by screws in such a manner so that it is easily replaceable and has negligible ‘END ERRORS’. Each block is fitted with a heavy lock type brass terminal which is mounted on an 18 mm thick laminated wooden board. The wooden board is equipped with sunmica on both sides. The four wires are stretched along the both ends of two full meter scales.

Same as cat. No. 1193 B but with 22 coils

Same as cat. No. 1029 but with 14 coils..

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The lamps give a steady light output of high intensity, and the special design of transformers ensure that the lamps ‘strike’ immediately they are switched on. When mounted on the integral stand, the lamp is enclosed by a cylindrical metal lamp housing with a circular aperture and the light centre height is adjustable from 200mm upwards. The transformer is an auto-leak type giving a starting voltage of about 470V which automatically reduces when the lamp has struck and regulates the current to 0.9A approximately. The transformer is housed in a two part sheet steel case with ventilation louvres and has lamp house sport rod mounted directly on to the transformer case to provide a convenient, self contained assembly. Without Lamp.
Cat. No.1198.005
SPECTRAL LAMPS
For producing monochromatic light at a high density. Each lamp is approx. 170 x 30mm with an E.S. cap. and Provide an arc centre height of 110mm. Both lamps are Fully interchangeable.
A Sodium
B Mercury

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This kit is very useful for reflection, refraction and colour mixing experiments. The light box consists of a light source (12v,24W lamp) producing convergent, divergent or parallel beam. On one end an adjustable cylindrical 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 aperture in the box are
provided with vertical channels to hold slits plates and colour filters. The optical set includes:
A / 10 acrylic blocks
B / Set of three mirrors
C / 2 slit black plates one with three narrow slits at one end and one narrow at the other end.
D / Black plate with four narrow slits at one end, one wide slit at the other end.
E / Set of severn mounted colour filters.

Nickel-plated brass heavy gauge. Packs of 100gm
Cat. No. 1198.003
A Brass 75mm
B Iron 75mm

Non-optically worked, with polished faces, edges slightly beveled. Nominal angles 60x60x60
1 Size 25mm
2 Size 38mm
C Size 50mm

90x45x45 degrees all faces fully polished.
1. Size 38mm
2. Size 50mm

60x60x60 degrees all faces fully polished.
1. Size 38mm
2. Size 50mm

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Right angled. Non- optically worked with polished faces, edges slightly beveled. Nominal angles 90x45x45.
1.Size 25mm
2. Size 38mm
3 Size 50mm

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Prism Crown D.F. E.D.F. D.E.D.F.
25mm
32mm
38mm