Abstract
A collection of more than twenty specimens of rocks of the best marked descriptions were chosen for the purpose, and were cut to a uniform shape and size by Messrs. Walker, Emley, and Beall, of Newcastle-on-Tyne, and a part of them were subjected to experiment. The plates are circular, 5 in. in diameter, and half-an-inch thick, and they are as smoothly and accurately ground to this uniform size as was possible in the case of some of the refractory substances as granite, whinstone, &c., that were employed. On the other hand, many more friable and softer rocks, as chalk, coal, marl, &c., are not included in the list of sample sections now collected.
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Conducting Power for Heat of Certain Rocks * . Nature 8, 540 (1873). https://doi.org/10.1038/008540a0
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DOI: https://doi.org/10.1038/008540a0