Central Telegraph
Guglielmo Marconi and his assistant George Kemp successfully demonstrated the wireless telegraphy system between two Post Office buildings on 27 July 1896. A transmitter was placed on the roof of the Central Telegraph Office on Newgate Street and a receiver on the roof of the General Post Office South on Carter Lane. The distance between the two buildings was 300metres. Later that year the Post Office provided funding for Marconi to conduct further experiments on Salisbury Plain. There is a plaque at the transmitter site (now the BT Centre), but no such marker on the building at the receiver site in Carter Lane.