What optical telegraph is made of
Chappe’s semaphore line.
- Semaphore tower — has part. A tower with movable sails.
- Semaphore signal arms — has part. The positions of the arms encode characters.
- Telescope — has part. Operators read the neighbouring tower through a telescope.
- Lens — uses. Signals were read through telescopes.
- Telescope — uses. Signals were read through a telescope.
- Lever — uses. The arms were moved by a system of levers and rods.
- Wood — is made of. Chappe’s semaphore has wooden arms on a mast.