Model of an Optical Telegraph, Model of an optical telegraph on a base. It consists of two posts at the top connected by an axis around which an arm rotates, the two ends of that arm have two narrow arms attached, one with a counterweight, the other without. The main arm is moved by a rope running over two discs on one side of the posts, the outer arms are moved with hoists running over a drum between the posts and placed on cleats against the posts. In the rectangular positions with respect to the main arm, the outer arms can be fixed with a spring. 1:22 scale (scale on model)., anonymous, c

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Model of an Optical Telegraph, Model of an optical telegraph on a base. It consists of two posts at the top connected by an axis around which an arm rotates, the two ends of that arm have two narrow arms attached, one with a counterweight, the other without. The main arm is moved by a rope running over two discs on one side of the posts, the outer arms are moved with hoists running over a drum between the posts and placed on cleats against the posts. In the rectangular positions with respect to the main arm, the outer arms can be fixed with a spring. 1:22 scale (scale on model)., anonymous, c. 1794, wood (plant material), brass (alloy), ivory, total: h cm foot: w cm × d cm radius of main arm: l 27 cm radius of wings: l 23 cm h 79 cm × w cm × d cm

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Size: 5157px × 6002px
Location:
Photo credit: © Artokoloro / Alamy / Afripics
License: Licensed
Model Released: No

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