Instructions for use
Select an object to view from the list below. To rotate either click on the rotate icon located in the bottom right hand corner of the image or click and drag within the object window.
Telesonic Lorgnette
Submarine telegraph cable
Cookes portable double-needle telegraph
School telephone
Portable double-needle telegraph, 1850
Box telephone, c.1877
John Gaveys ring transformer
Valve heater transformer
In the 1890s Gavey was assistant to W H Preece, engineer-in-chief of the Post Office. He designed this transformer for use with Preeces experiments in wireless telegraphy and telephony by means of conduction and electromagnetic induction.