Neil Bygate demonstrates a heliograph. "used a bit before our time" to send flashes of sunlight in morse sequences. At back (from left) Frank Pawley and John Davis assert that it was "only used two days a year in Waiouru"!
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Ruapehu Bulletin, Volume 10, Issue 484, 4 May 1993, Page 1
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40Neil Bygate demonstrates a heliograph. "used a bit before our time" to send flashes of sunlight in morse sequences. At back (from left) Frank Pawley and John Davis assert that it was "only used two days a year in Waiouru"! Ruapehu Bulletin, Volume 10, Issue 484, 4 May 1993, Page 1
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