Slotted metal disc, with finger hole and having 12 radial slots, mounted on a handle.
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Highly sensitive, good quality with rubber tubing, useful for observing faint sounds and vibrations after due amplification
Comprising two plastic tubes one 305 x 32 mm diameter, the other 305 x 25 mm diameter. The small tube slides within the other in foam plastic collars, allowing the air column length to be varied from 300 to 530 mm.
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 aluminium tubes telescoping into each other, so that the column of air within the tubes may be altered from 30 cms to 53 cms, outer tube fits into a wooden base.
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