K/PP107/11/1/7

Dated 1850-1875. From Scientific apparatus, musical instruments and telegraph equipment, [1834-1875].

Prototype telegraph transmitter with 30 keys each representing a letter or number and operating a make and break contact sending pulses of current down the line to a receiver.  Thirty unmarked ivory concertina style keys on a round mahogany base and octagonal mahogany lid.