What is a heliograph;explain
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What is a heliograph;explain

[From: ] [author: ] [Date: 12-05-01] [Hit: ]
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It is a device for signaling with a mirror. See the link for details. During WWI the Navy gave us airmen a signaling mirror, a simple heliograph. With it we could try to attract the attention of search aircraft if we were to crash, or be afloat at sea.
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