Physics Instruments

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The instrument consists of two round scales. One with index and the other with vernier. The first scale (index scale) is for turning the analyzer into the azymuth. The second scale (vernier scale) is for measuring the degree of orientation of a wedge box. The wedge box contains two wedges cut in mutually perpendicular direction of optics axis in quartz. The long wedge is movable by means of a micrometer screw minimum reading of the movement is taken. Micrometer screw minimum reading 0.001 cm. 1291 (a) Without Quarter Wave Plate 1291 (b) With Quarter Wave Plate

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It consists of a stainless steel rod of 1 meter long and 1.0 cm diameter. The 5.s. rod is marked with lines at equal distance of 5 cm. Two circular removable knife edges are provided, complete with wall bracket & two circular knife edges.

A chrome plated brass bar of dimension 100x25xO.5 cm bored at equal intervals of 5cm and provided with two removable knife edge. Complete with wall bracket.

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It consists of a powdered coated steel bar of dimensions 100x3.75xO.5cm with a number of equidistant holes drilled along its length at equal intervals of 5 cm. The pendulum is provided with two removable knife edges passing through any one of the holes. Complete with wall bracket & two removable knife edges

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This stand is suitable for all types of compound pendulums or Kater's pendulums listed above. Heavy type stands having approx. height 52 inches

For school/college laboratories. Nominal 6 mm bore glass tube. With engine divided dual scales 675 to 820 x 1 mm Hg and 26.5 to 32.5 x 0.05 inch Hg. Verniers reading 0.05 mm and 0.002 inch. Mounted on polished wooden board for wall mounting. Supplied without mercury but with instructions for filling
SPARE S

(A)	Standard Model 8 mm Borosil glass tube
(B)	Deluxe Model 10 mm Borosil glass tube
(C)	Leather Bag

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This bridge method is more complicated than those which have been described so far. The bridge has the following characteristics :

P =	consists of three ratio dials of 10, 100 & 1000 ohms.
Q =	consists of three ratio dials of 10, 100 & 1000 ohms.
R =	non-inductive resistance of 1000 ohms (fixed value).
S =	A variable non - inductive resistance in the form of 3 decades of 1 x 10, 10 x 10 & 100 x 10 ohms. This resistance also includes the resistance of self - inductance ‘L’ which is also connected to the same arm.
M =	A non-inductive variable resistance of 3 decades of 10 x 10, 100 x 10 & 1000 x 10 ohms.
C =	A standard capacitance provided in the bridge in the form of a single decade of 10 x 0.01 mfd. Supplied with unknown inductance L whose value is to be calculated.

Supplied without headphone and oscillator

It is an arrangement to hold specimens in the form of wires, rods strips etc. Separate current & potential terminals are provided. Distance between potential points is 50 cm. It can hold specimen of any size between ½ “ dia. rod 42 S.W.. wires.

The unit is mains operated and can deliver a continuously adjustable D.C. Current of 0-10 Amp maximum. The unit consist of a variac, a step down transformer, a bridge rectifier, filter circuit and an ammeter of 0-10 A to read current. Two heavy brass terminals are provided for output Input voltage: 230 V A.C. Mains 50 c/s. D.C. Output : Approx. 0-10 V, continously adjusted to give a variable current of 0-10 Amp depending upon external load.

Standard Resistance: There are 10 coils of .01 ohm each arranged on a rotary dial plus a circular slide wire of total resistance .01 ohm and 500 sub divisions is equal to .00002 ohms on the normal range. Multiplying Ratios: A single rotary switch furnishers 5 multiplying ratios of x 100, x 10, x 1, x .01 and x 0.01. Range of measurement: The bridge has a range of .0000002 ohm to 11 ohm. Max. Current: 10 A intermittently & 5 A continuously. Panel: A bakelite panel enclosed in a teak wood box is used. Separate current and potential terminals, battery and galvanometer terminals, push buttons for battery and galvanometer are provided on the panel. Accuracy: ± 0.5% current 5 Amps upto 10 Amps. Coils: Mangnin coils are used.

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For use with kohlrausch conducting bridge

Conductivity Coil with platinum electrode for use with kohlrausch conductivity bridge, Dip type.

A circular slide wire is calibrated from 0.01 to 10 ohms. A rotary dial furnishers 6 mutipliers of 0.1, 1, 10, 100, 1000 & 10000. Range of measurement is 0.01 to 100 K Ohm. Terminals for supply and head phone detectors are provided on the panel. A detector key is also provided. The position of slider is adjusted to the position of minimum sound. Accuracy of coils ± 0.1%. Accuracy of measurement ± 1% at mid scale ± 2% overall. Accessories for Kohlrausch Conductivity Bridge