This is early 1900 version, a great great piece of history.

Essentially an electromagnetic (relay) with self on of contract and huge number turns coils. You may be proud to re do the great history, with mini size components

http://www.youtube.com/watch?v=YSf93g0heUA

This is early 1900 version, a great great piece of history.

Essentially an electromagnet (relay) with self on off contact and huge number of turns coils. You may be proud to re do the great history, with modern mini size components

http://www.youtube.com/watch?v=YSf93g0heUA

This is early 1900 version, a great great piece of history.

Essentially an electromagnetic (relay) with self on of contract and hung number turns coils. You may be proud to re do the great history, with mini size components

http://www.youtube.com/watch?v=YSf93g0heUA

This is early 1900 version, a great great piece of history.

Essentially an electromagnetic (relay) with self on of contract and huge number turns coils. You may be proud to re do the great history, with mini size components

http://www.youtube.com/watch?v=YSf93g0heUA