Tyndall, John, 1820-1893 · New York, D. Appleton · leaf 113
able; and thence to the other 88 HEAT A MODE OP MOTICX. EECT. IT pole of the battery. The instrument in front consistsmerely of an arrangement to support a spiral, C, of platinumwire, which will glow with a pure white light when thecurrent from d passes through it. At the present moment the only 1… … bars are heated and the metals expand. The spiral remainsfor a time non-luminous, the bridge not being complete;but now it brightens up, proving the extension of oneor both the bars from stand to stand. On removingthe iron, the platinum still glows: restoring the iron, andremoving the brass, the…
Heat
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