Ubicación virtual: Telegraphy

Metal and wooden appliance. Magnetic field formed by the legs of the

Wooden base, transformer and signal drive.

Used on wall phones that had a side hook for hanging.

Portable device. Wooden box with electromagnet and circle with letters. Signal drive system with impulse needle.

Wooden device integrating tape receiver, electromagnet and signal drive system. Measurement dial and bell.

Wooden base with device to send signals.

Wooden base with metallic components for emission of electrical impulses.