De quoi est fait optical telegraph
Chappe’s semaphore line.
- Semaphore tower — a pour partie. A tower with movable sails.
- Semaphore signal arms — a pour partie. The positions of the arms encode characters.
- Telescope — a pour partie. Operators read the neighbouring tower through a telescope.
- Lens — utilise. Signals were read through telescopes.
- Telescope — utilise. Signals were read through a telescope.
- Lever — utilise. The arms were moved by a system of levers and rods.
- Wood — est fait de. Chappe’s semaphore has wooden arms on a mast.