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· Techniques for visual signaling through the development of the heliograph. It employed two adjustable mirrors so arranged that a beam of light from the sun could be reflected in any direction. The beam was interrupted by a key-operated shutter that permitted the formation of the dots and dashes of the Morse code.
F THIS PIECE WAS MANUFACTURED IN 1940. IN VERY GOOD CONDITION WITH CARRY CASE.
IT NEEDS A GOOD CLEAN AND IF YOU WANT SOME PAINT.
I THIS IS A VERY COLLECTABLE ITEM.
POSTAGE AT COST OF BUYER
V
PLEASE NOTE: I DO NOT SELL FAKES. IF IT IS YOU CAN RETURN PRODUCTS AND I WILL REFUND YOU.
