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Excerpt from Thermal and Physical Changes Accompanying the Heating of Hardened Carbon Steels The materials studied were seven steels Of the compositions given in Table 1. Heating for quenching, as noted on the curves and in the tabulated results, was carried out on the prepared. Samples by introduction into an electrically heated alundum-tube furnace wound with resistance wire. Charcoal was present to reduce oxi dation, and a platinum, platinum-rhodium thermocouple was used for the measurement of temperature. In tempering, the specimen was heated 30 minutes in an oil or nitrate bath, as required by the temperature. Temperatures below 300 Degrees C were measured with a mercury thermometer. All samples of the quenched 0. 9 5 per cent C steel not receiving sub sequent tempering were run within from I to 3 days after quenching. All the other steels not tempered were run within from 6 to 16 days after. Treatment, excepting the I. OI per cent C and I 94 per cent C steels (curve which were run the day follow ing treatment. About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works.

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