← The boy mechanic, book 3, Volume 3
Chapter 123
Signal for Lighted Lights in Basement
To avoid the loss of electric current by forgetting to turn out the light in the basement, I placed a 3-cp. lamp in the circuit near the switch at the head of the stairs. The small light is a signal that the light is still turned on in the basement.—Contributed by A. MacCunn, Toronto, Can.