Go back to article: A tale of two telegraphs: Cooke and Wheatstone’s differing visions of electric telegraphy

Figure 3

Colour photograph montage showing Wheatstones escapement or dial telegraph showing the transmitter and receiver side by side

Wheatstone’s escapement or dial telegraph (1840 specification) employed two wires for its operation and was based on the step-by-step technology. The transmitter (or communicator) can be seen on the left, the receiver (or indicator) on the right.