Tyndall, John, 1820-1893 · New York, D. Appleton · leaf 472
scence. Here LECT. XV. THERMOGEAPFT OF CARBON POINTS. 447 also a thermograph of the carbon-points was stamped out.When black paper is placed at the focus, the thermal imagebeing well defined, it is always pierced in two points,answering to the images of the two carbons. The superiorheat of the… … Paper reddened by the iodide of mercury had itscolour discharged at the places on which the invisibleimage of the carbon-points fell upon it, though not withthe expected promptness. Disks of paper carbonised by different processes wereraised to brilliant incandescence, both in the air and inan…
Heat
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