A three-way switch that was used to cut the headlights of a trolley and subsequently turn on the taillights. K is the switch blade, and L is a spring contact clip, three of which are raised on 'posts' (L1 is not raised).
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International Correspondence Schools A Textbook on Electric Lighting and Railways (Scranton, PA: International Textbook Company, 1901)
Courtesy the private collection of Roy Winkelman