Filings coherer, small glass tube with bulb at one end and cap of red sealing wax at other end, 1898 1898
Replica of Liverpool & Manchester Railway 1st Class carriage 'Traveller' 1930 (replica); 1834 (original)
Pole pieces for same magnet altering to annular gap approximately 3 7/8" to 3 5/16", part of Oliver Lodge’s microphone amplifier or relay, 1898 (British patent 9712 of 1898) ), a precursor of the moving-coil loudspeaker Pole pieces for same magnet altering to annular gap, 1898 1898