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Summary Departents Categories Organisations People Series Glossary
Glossary Item: Heliograph
Name Heliograph
Description A wireless telegraph that signals by flashes of sunlight reflected by a mirror. The flashes are produced by momentarily pivoting the mirror, or by interrupting the beam with a shutter.
Books that contain this Glossary Item
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Name Atlantic Bridge, The Official Account of R.A.F Transport Commands Ocean Ferry
Category Merchant Seamen
Issued By Ministry Of Information
Issued For Air Ministry
Published Feb/1945
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