A rubber ring mounted on a metal disc with steel rod and wooden handle
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This unit provides continuously variable D.C outputs for the ripple tank motor, together with a fixed A.C output to operate lamp, supplied with a detachable mains lead.
It comprises two tuning forks each of frequency 426 Hz on two separate resonance boxes. One fork is fitted with adjustable loading mass. When both forks are sounded together, a clearly audible beat is produced. Rate of beats depends on difference in frequencies. This difference can be increased by changing the loading mass.
Overall length when fully extended is about 840 mm approx., 540 mm when closed, stoppered, and made of varnished wood with movable piston marked with the chromatic scale from C (256) to (512)
Comprising a hollow wooden resonance box, with two meter rules graduated in millimetres, mounted on top on either side along the length.
One each of brass and steel wires of different diameter attached to fixed bridge on one end of the box and tensioned by wrest pins at the other end. A pulley mounted at the end supports third wire over it with masses suspended to the wire end. Includes two short and two long bridges for adjusting length of vibrating strings, and additional wires one each of steel and brass of 22SWG.
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