Delhi, India
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Used for Comparison of Capacities The two arms of the bridge comprise of 3 decade dials of 10, 100 & 1000 Ohms each. The third arm is provided with a Standard Capacitance in the form of a single decade of 0.1 x 10 Mfd. The Experimental Capacitance is placed in the remaining arm. Terminals are provided for unknown Capacitance, Head Phone & A.C. Supply Provided with inbuilt audio oscillator, headphone and experimental capacitance & working instructions.
For demonstrating Brownian motion. Designed for use with a microscope. A short cylindrical cell, closed by a cover glass, is held vertically in an opaque channel 90 x 90 x 30 mm. Illumination is by an integral filament bulb & cylindrical glass lens. The cell enables Brownian motion to be observed for at least 15 minutes after charging the cell with smoke. Fitted with 4 mm socket terminals for connection with 12V supply.
With two cast end pieces jointed by three nickel plated rods which carry two sliding V supports for a glass jacket with inlet & outlet tubes. One end piece fitted with spherometer reading to 0.005 mm & the other with contact screw. The glass jacket enclose both a brass & a copper rod each 500 x 6 mm fitted through corks, a half turn of the jacket changing the rod in contact with the spherometer. A thermometer can be attached to either side of the rods by rubber bands. Brass terminals are fitted to the apparatus so that an electrical circuit can be made through either rod to indicate the moment of contact of centre tube & spherometer.
