Telegraph block instrument (sending and receiving)
Telegraph Block Instrument, Tyers Train Describer
Telegraph block instrument, South Eastern Railway
circa 1905
Telegraph block instrument (sending and receiving)
Telegraph block instrument, early Walker's type
Telegraph block instrument (sending)
Telegraph block instrumet; "Niddrie North Junction"; made by W R Sykes Interlocking Signal Co
Tyers Train Describer, North British Railway
Telegraph block instrument
Telegraph block instrument; "Niddrie North"; made by W R Sykes Interlocking Signal Co Ltd
Cooke and Wheatstone double needle telegraph, 1844
1844
Telegraph block instrument in green metal case
Telegraph block instrument, Preece's type
Telegraph instrument; single needle
Telegraph block instrument, Great Eastern Railway
Telegraph block instrument (sending)
Telegraph block instrument; Walker's type
Telegraph block instrument (sending/receiving)
Telegraph block instrument
Single-line instrument (sending/receiving)
Telegraph block instrument; South Eastern Railway; Walker's patent No. 245
1855
Double needle telegraph instrument
Telegraph block instrument; Walker's
1865
Peas & Partners Alphabetical Telegraph Instrument
1846
London & North Western Railway telegraph block instrument
Fletcher's double-line block instrument, London & North Western Railway
Telegraph Sender
1918-1923
experimental Lodge-Muirhead wireless telegraph receiver, 1900-1910
1900-1910
Three telegraphic signalling block instruments
Magneto-electric telegraph
Morse Key
1940-1945
Telegraph block instrument; Sykes' Lock and Block with integral semaphore indicator
Telegraph block instrument, Lancashire & Yorkshire Railway
Alexander Bain's telegraph instrument
1846
Telegraph block instrument, Lancashire & Yorkshire Railway
Alexander Bain's telegraph instrument
1846