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A single-pole lamp switch commonly used in the early twentieth century. It could control a single circuit or any number of circuits within its capabilities. When the knob (h) is turned to the right, and the connected spring (p) is wound as far as possible, the blade (k) is loosened from the contact tips (s) and thus breaks the circuit.

Lamp Switch

A single-pole lamp switch commonly used in the early twentieth century. It could control a single circuit…

A typical lamp switch used in the twentieth century, with a cover. These lamp switches were widely used for general purposes, but were used especially often in conjunction with trolley cars.

Lamp Switch

A typical lamp switch used in the twentieth century, with a cover. These lamp switches were widely used…