Chronoscope, D'Arsonval's electric chronometer
Chronoscope, D'Arsonval's electric chronometer, by G. Boulitte, Paris with two switch devices and green cabling
Chronoscope, D'Arsonval's electric chronometer, complete with two switch devices, by G. Boulitte, Paris
Chronoscope, D'Arsonval's electric chronometer, by G. Boulitte, Paris with two switch devices and green cabling
Lid for chronoscope labelled 'PSY/387/716/R' from chronoscope, D'Arsonval's electric chronometer, complete with two switch devices, by G. Boulitte, Paris