Physics Instruments

Rheostat of excellent quality. They are wound with heavily oxidized resistance wire upon a vitreous enameled steel tube. The winding is locked into place with ceramic cement.

The tube is carried upon robust enameled die-cast end stands. 4mm socket terminals are fitted, allowing for rheostat or potentiometer connection.

Chromium plated with cylindrical weight with long hook.

Cat no.              Capacity

1              10gm each weight, set of 12

2              20gm each weight set of 12

3              50gm each weight set of 12

4              100gm each weight set of 12

Rust proof set of five including hanger sensitiveness 2%to 3%.

Cat.             No. Capacity

1)                10 x 5 gm.

2)                20 x 5 gm.

3)                 50 x 5 gm.

4)                 100 x 5 gm.

5)                  250 x 5 gm.

Microscope: Mounted on a traveling

carriage fitted with 10 x rams den eye

piece, cross line graticule, achromatic

object 75 mm working distance, focusing

by rack &pinion.

Scale : Graduated in half millimeters on

inlaid strip of nickel silver, vernier

attached, microscope traverse, 16.5 cm.

Base : Heavy cast iron, top nicely machined, traveling carriage slides on the top, which can be clamped in any position. Fine motion screw for finer adjustment.
Complete with case.
Motion : Special design measure object in X as well as in Z direction.

Comprising a wood resonance

box 1140 x 100 x 85mm ( length

x width x height ) with meter

scales one

meter long sub divided in millimeter. One each brass and steel

wires of S.W.G 26 and 24 respectively, attached to a fixed bridge

and tensioned by fine adjustment pegs: two moveable Bridges,

pulley and fixed screw to enable a third wire to be fixed for

tensioning by weights Wooden resonance box is made from,

superior quality wood and all metal parts are of brass alloy.

It consists of a small metal frame, supported

by three legs fixed at the corners of an

equilateral triangle. A screw of fine pitch

passes through the center of the metal frame.

The screw forms the fourth leg. The main

scale (or pitch scale) is marked in a metal

strip fixed at right angles to the frame. This

scale is marked in millimeters with zero mark

at the center (10-0-10 mm). A circular scale is

fixed to the screw head. It carries a

circular scale divided in 100 equal parts (In some cases it is divided

into 50 equal parts). The edge of strip is used also as a reference

line fro taking the circular scale reading. The disc & scales are

brass lacquered &legs are made of steel black painted.

1) 1/100

Copper cylindrical body with conical top and short neck for bung. Fitted with steam outlet tube riffled for rubber tubing.

A. Cap. 1 liter

B. Cap. 2 liter

C. Cap. 3 liter

to overcome the difficulties experienced in mechanical stop a clock, PSAW has introduced quartz controlled 3 ½ digit stop clock. The start/stop operation is by means of a mini toggle switch and reset by a push button. Reset is possible only in stop mode to avoid accidental resetting while the clock is running.
specifications :

Range :                    999 sec.

Resolution :                0. 1 sec.

Accuracy :                  0. 1% (quartz controlled)

Display :                      12. 5 mm bright seven   segment display

Working voltage : 230 volts a. C. +-10%

Reset : by push button

Least count : 1 second

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 rams den eyepieces are used. Supplied with

scale and scale holder.

The sensitive focusing 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

Cylindrical body with conical top and short neck for bung. Fitted with steam outlet tube riffled for rubber tubing.

A. Cap. 1 liter

B. Cap. 2 liter

C. Cap. 3 liter

This hygrometer-thermometer indicates the

indoor humidity and the indoor & outdoor

temperature. It features a LCD display with

digital alarm clock, minimum - maximum

temperature memory read, wall mount or

folding stand option, 9.8 foot outdoor

weather-proof sensor wire and 1AAbattery.

It comprises of a spring mounted steel

vibrator arm which carries a contact

connected in series with a solenoid.

The free end of the vibrator carries a

marking point which strikes the paper

tape through a disc of carbon paper,

thus making the tapes once for each

oscillation. It works on 12 volt, 500 mA

A.C. Power supply. The complete

instrument is mounted

upon a polished wooden base and 4 mm socket terminals are

provided for electrical connection. Complete with one dozen round

carbon papers and roll of paper strip.

The traveling microscope consists of a cast

iron base with machined vee - top surface and

is fitted with 3 leveling screws, one being

fixed. The microscope can travel horizontally

22 cm and vertically 15 cm with the help of

slides. The slow motion knobs are provided

for taking accurate readings.

Vernier readings 0.01 mm or 0.02 mm. The

microscope tube consists of an eyepiece 10 x

with 15 mm or 75 mm objective, for holding objects horizontal

stage, made of milky cenolite sheet provided on the base

Made from soft wood, smoothly operating graduation up to 50 cm, provided with aluminum channel for smooth movement of the jaw.

The PSAW vertical reading microscope

consists of a microscope with rack

focusing adjustable vertical column. The

stereotyped design of the vertical column

moving through 15 cm by rack & pinion is

now replaced by a superior quality

vertical pillar carrying the scale with the

entire 15 cm vertical lift by Smooth rack &

pinion, moving inside a heavy vertical

column carrying the brass vernier.

Vernier spring is loaded for precise apposition to the scale. A guide

slot &key ensure up &down movement in the same plane.

The stainless steel scale & vernier is machine divided to accuracy

within 0.01% or better. The horizontal microscope tube is mounted

on the vertical column, and is adjustable by smooth rack & pinion,

through twin knobs on both sides. The microscope moves on the

machined inter ground guides.

For demonstrating wave motion. Helical coil of

flat section tampered steel wire. Coil dia 7.5cm

length closed 10cm fully extended 3mt.

It consists of 18 aluminum discs

supporting a series of iron nickel

rods. On revolving the handle the

motion is transmitted successively

from one rod to the next, appearing

as a wave traveling to the top and

back. The movement of the waves

can be observed. All metal parts are

fitted on a superior quality polished

wooden board.

A. 3” x 2” x½“

B. 4” x 2.5” x 1”

These wi res are used for

connections in various electrical

and electronics experiments.

Supplied in 100gmpacking only.

SWG No. -20, 22 & 24.

Made from an alloy of magnet, nickel

and copper, with a low temp.

Coefficient. This wire is particularly

suitable for the construction of

resistance coils etc. Or any application

where accuracy of ohmic value is the

important factor and electrical loading

is low. Supplied in 100gmpacking only.

S. No. SWG No.Dia.

(In mm)

1) 200.71

2) 220.56

3) 240.45

4) 260.40

(Research model half shade for 400 mm tube) Sensitive rotating half shade device.

Circular scale 0-3600 combined with sugar

scale - 0 to 300 s to + 1300 s Vernier least

count 0.050.Aluminum casted rigid body.

Arrangement for 35 W sodium lamp light

source, input 220/230 V AC. Borosil glass

tube 100mm&200mmcup type.

The cone bearings are of selected material and the upper and lower parts of the arms are turned and ground in one operation giving the most accurate alignment. Clamps for telescope and prism table are designed so that no strain cones on the cone bearings from clamping, thus avoiding any disturbance.

This coil, specially designed for

school use is suitable for vacuum

tubes and audiometers etc. It is

wound with insulated copper wire,

has tungsten contacts and on/off

reversing switch as communicator.

Voltage tested condenser are fitted

inside the teak polish wooden box.

The top of the

wooden box is provided with sun mica and relevant data engraved

on the sun mica. Terminals are provided for H.T. output and L.T.

input of the coil. Up to 50 mm spark is obtained with 4 to 6 volt D.C.

input and spark from 50 to 100 mm can be obtained by 6 to 12 volt

D.C. input

N metal frame and bake lite

handle, chrome plated.

A         50mm            20cm                 2.25x

B          50mm            10cm                 3.5x

C          60mm            10cm                 3.5x

D          60mm            15cm                 2.5x

E           60mm            20cm                 2.25x

F           75mm            15cm                 2.5x

G           75mm            10cm                 3.5x

H           75mm             20cm                2.25x

I            100mm           15cm                 2.5x

J           100mm           20cm                  2.25x

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.

Two pith balls are suspended by a silk thread from an insulating stand approx. 15 cm high.

An insulating stand on tripod base,

hammers tone finish, three

different shapes of medium size

conductors are provided in the set :

A) Conical shaped conductors:

shows that the distribution of static

charge on a conductor depends

upon the curvature of the surface.

B) Hollow sphere shaped conductor:

show that charge resides on the outside of the conductor.

c) Cylindrical shaped conductor: shows that electrostatic charge

is only on the outer surface of the conductor.

For showing that electrostatic charges is always on the outer surface. The conical shaped silk net is attached to a ring mounted on an insulating stand and may be turned inside out by means of attached strings.

It consists of one voltmeter of 10 V, one millimeter of 25 mA. Two 4 mm socket terminals are provided for the connection of unknown resistance & another two terminals for D.C. supply. As on/of switch and a potentiometer of 25 OHMS, 3 W is also provided. The whole system is enclosed in a superior quality plastic box. Supplied without resistance coil and D.C. supply.

The magnifier i fitted with a precision lens of

150mm diameter and with an optical glass

lens of 3x. It has maximum possible power for

a lens of its size, consistent with gives

fatigue- free, stereo view equipped with

round fluorescence tube (22Watt ) which has

shadow -less illumination. It is fitted o a

universal stand fully adjustable vertically and

horizontally, works on 220VA.C

This air pump is suitable for a number of classroom demonstrations, single barrel made from steel pipe fitted on wooden base. The aluminum plate is provided with a stop cock, air inlet screw and a connection for rubber pressure tubing.

They include all principles of geometrical solids and figures discussed in elementary mathematics and physics are included. 16 different solids are made of smoothly finished hardwood, medium sized, approximate size of each figure is 5 cm. All are supplied in a sliding box.

A ventilated lamp house having an open front with extended sides finned externally for heat dissipation and vertical internal grooves to accommodate a slit plate and cylindrical lens. It has a light source comprising of a 12 volts lamp in a holder with one meter of twin flex having banana plugs. Complete with metal slit plate having single and triple slits and whitened on one side and other side matt black.

For comparing the densities of liquids by measuring the heights of two columns of liquid produced by applying suction to the short center limb. Comprising three limbed glass tube mounted on polished wooden stand with meter scale 45 cm. Long with '0' at the bottom. The scale is divided in centimeters and millimeters. Supplied w/o rubber tube and pinch cock.

To demonstrate the pressure of the atmosphere. Two concave aluminum cups having diameter either 62 mm. Or 75 mm. Are provided with handle and stop cock.