K/PP107/11/1/14

Dated 1840-1850. From Scientific apparatus, musical instruments and telegraph equipment, [1834-1875].

Telegraph relay used for long distance lines by re-transmitting a signal to the receiver or other apparatus.  Consists of an electromagnet housed in a semi-circular wooden case. [See K/PP107/1/4/100 for a description of improvements for relay for automatic telegraph.]