An example of electricity: early galvanometer.

Electricity

An example of electricity: early galvanometer.

An Edison fuse plug and casing for switchboard use.

fuse plug and casing

An Edison fuse plug and casing for switchboard use.

A two pole front connected knife switch fused at the handle end.

knife switch

A two pole front connected knife switch fused at the handle end.

A three pole rear connected knife switch fused on the hinge end.

knife switch

A three pole rear connected knife switch fused on the hinge end.

Showing the construction of a quick break knife switch.

knife switch

Showing the construction of a quick break knife switch.