A Manual of Experiments in Elementary Science: Teacher's Edition (1918)
Curtis, Francis D. · Charles E. Merrill Company · leaf 110
o complete the circuit. 2. When the circuit is completed at the push button, only the exhaustion of the cell or the breaking of the circuit at some other place will cause the bell to cease ringing. 3. Dynamo, motor, telegraph sounder, telegraph receiver, lifting-magnet, etc. 4. This question may be… … Explanation. — One wire from one terminal of the bell serves for all the push buttons; the wires connecting the push buttons with the other terminal of the bell and of the cell must be in parallel with each other, i.e. so that the push¬ ing of any one of the three buttons results in closing the…
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