Name: Robert Hooke's proposal for an aerial telegraph (semaphore),1684. Thirty symbols cut out of wood were hidden behind a screen, A, supported on a wooden framework. By pulling the rope, D, a symbol could be drawn into view at B, and seen through a telescope by a distant observer. Print published in Paris circa 1870 - SuperStock
Brand: Image Asset Management
SKU: 1746-21117338
Availability: InStock

Robert Hooke's proposal for an aerial telegraph (semaphore),1684. Thirty symbols cut out of wood were hidden behind a screen, A, supported on a wooden framework. By pulling the rope, D, a symbol could be drawn into view at B, and seen through a telescope by a distant observer. Print published in Paris circa 1870

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