The coils of the electromagnets are differentially wound with silk-covered wire, 4 mils (= 004 inch) in diameter, to a total resistance of 400 ohms. This differential winding enables the instrument to be used for " duplex " working, but the connexions of the wires to the terminal screws are such that the relay can be used for ordinary single working. [Please select]
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The pendulum bob at the lower end is adjusted to swing just clear of the electromagnets. [Please select]
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"Were these transmitters and receivers made from electromagnets and strips of flat steel, as you told us the other day." [Please select]
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If you are able to secure the electromagnets from a discarded electric bell they will work fine for the magnets M1 and M2. [Please select]
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