Description

Fitted with 4 mm socket

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

sized to detect bidirectional milliampere currents in induction

and mammalian organ systems for comparative vertebrate teaching

Morse Sounder Mechanics_Force & Motion Fitted with 4 mm socketUsed 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 Fitted with 4 mm socket

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