Discoveries and inventions of the nineteenth century (1905)
Routledge, Robert · London : G. Routledge and Sons · leaf 707
. If, therefore, wires froma battery, K, including an electro-magnet, I, in their circuit, be connectedwith the bar at C, and with the mercury at H, when the wire at F touchesthe float, the current will pass and the armature of the electro-magnet will RECORDING INSTR UMENTS. 6^^ be attracted. The… … Fig. 315.—Registration of Height of Barometer and Thermometer. of the mercury in H. When the lever is depressed at the other end, thewire, E, similarly completes the circuit through the mercury in the thermo-meter, and the height of the latter can be known from the dot which issimilarly impressed…
Inventions
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