Model of an Optical Telegraph, anonymous, anonymous, 1795 - 1816 Canvas Print
Model of an optical telegraph with code. The telegraph consists of a wooden board with seven different sawn-out shapes in a row, which can be covered with brass folding doors. The code, pasted with ink on paper on a separate shelf, gives the signal combinations for the letters of the alphabet and three punctuation characters, the comma, the colon and the period.
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