SOMETHING TO MAKE.
FOR TRAMP OF FLY. £ am about to describe a jolly instru3n«nt with which you can hear the tramp jof a fly over some hundred yards. Get a round stick of carbon, sxich as is ijised in torch batteries (a), and pivot
to a brass support, as shown. It should bo placed so that it rests with slight [pressure of its own weight on a block of < arbon (b). One wire is joined to the lii-asa support, and another to the block ;<b). Theso are led to the battery and receiver, as shown. The ticking of a pratch will be very loud when heard through this yimple little instrument.
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Bibliographic details
Auckland Star, Volume LIX, Issue 165, 14 July 1928, Page 3 (Supplement)
Word Count
111SOMETHING TO MAKE. Auckland Star, Volume LIX, Issue 165, 14 July 1928, Page 3 (Supplement)
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