Registering height above the ground instoad of altitude abovo sea level, acoustic altimcters may soon be available as^ safety equipment for aeroplanes. 'lhis type of instrument, whicb operates by measuring the time required for, sound waves to travel to the ea/th and return, has hitherto been inipracticable for use iT heavier-than-air craft. Tn the iinproved model, being perfected by Lieutenant Leo P. Delasso, U.S.N.R., calculations are eliminated by recording the elevation direct--ly on a diaL ,
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https://paperspast.natlib.govt.nz/newspapers/HBHETR19370830.2.80.3
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Hawke's Bay Herald-Tribune, Issue 191, 30 August 1937, Page 6
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75Page 6 Advertisements Column 3 Hawke's Bay Herald-Tribune, Issue 191, 30 August 1937, Page 6
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