The singleneedle instrument is a vertical needle galvanoscope worked by a battery and reversing handle, or two " tapper " keys, the motions to right and left of one end of the index corresponding to the dashes and dots of the Morse alphabet. [Please select]
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[Illustration: Galvanoscope] The instrument will then be adjusted ready for use. [Please select]
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--By having a coil of insulated wire, with a magnet suspended so as to turn freely within the coil, forming what is called a galvanoscope. [Please select]
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The galvanoscope and electro-magnet do not respond equally to all currents, and this is also true, even to a greater extent, with the calorimeter. [Please select]
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