Printed photographic reproduction illustrating two wiring plans for a doorbell: one bell and two push buttons with either button ringing the bell, the other showing two bells and two push buttons with each button ringing one bell.
Illustration found within junior high school/high school-level textbook on science with topics including air; food; water; weather; fire; heating, lighting and electricity within homes; clothing and microscopic organisms. Begins with a foreword to the teacher with subsequent content including scientific projects and experiments. End of book contains a bibliography of children's books on science as well as as list of equipment needed for text teachings. Scientific diagrams and illustrations can be found throughout the text including printed photographic reproductions of students conducting experiments and lab equipment setups for experiments.
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Tower, Samuel Francis. “Electrical Wiring Diagram for Doorbells.” The Science of Common Things; a Textbook of General Science. Boston, Massachusetts: D.C. Heath and Company, 1922. https://digital.sciencehistory.org/works/gf06g381f.
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