Ijtunnel Fernsig Essen sound powered telephone
Ijtunnel Fernsig Essen, sound powered telephone
these were used in the IjTunnel, the tunnel connecting north Amsterdam with the rest of the city
wall hung / mounted
cast metal with lots of patina
There is this odd thing: a sound powered telephone. It needs no power, just a direct connection to another sound powered phone, or a small network of sound powered phones.
“Sound powered telephones, handsets or headsets, contain electro-mechanical transducers that convert voice directly into electrical energy. This signal is sent down to a two-wire line and converted back into voice at the other end. The phones require no batteries, amplifiers or power supplies, emit no electro-magnetic or radio-frequency interference, present the user with no shock hazard and yet are capable of transmitting clear voice communications over distances up to five miles.” (tekst by Dynalec)
These were (and still are) used in situations where power failures were common and it was imperative that people still be able to communicate. Factory’s, tunnels, coal mines and on boats. Also, after installation there were no further costs, these are very low maintenance and long lasting.
industrial, vintage, retro, phone
ship, maritime, decorative, object, decor
old, rugged, rough, tough, work environment
phone is 9 cm deep, with handset 12 cm
1 in stock