Description

sized to detect bidirectional milliampere currents in induction

used in step-up and step-down ratio demonstrations of Faraday's law

this 4-inch carbon-steel needle pivots on a brass cup bearing for low-friction rotation under the local field

Three-finger vinyl-coated jaws open to 3

Morse Sounder Mechanics_Force & Motion sized to detect bidirectional milliampereUsed to receive Morse code signals as audible clicks, this electromagnet driven pivoted arm sounder on a wooden base produces the snap of early telegraph operation when current pulses the coil.

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Morse Sounder Mechanics_Force & Motion sized to detect bidirectional milliampere

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