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Scientific American, Vol. 67, No. 9 (August 1892) (1892)

leaf 4

An illustration from Scientific American, Vol. 67, No. 9 (August 1892), 1892, leaf 4
osition of its upper surface changed. At a depth hardening the surface of the plate by the Harvey car- about 1 per cent. of about three inches from the surface the percentage Up to the present the experimenters have confined bonizing process. Now we have the full demonstra- of carbon has been… … lish Mechanic, Fig. 1-LABORATORY IN THE EIFFEL TOWER. PARIS. the record of the tuning fork, © 1892 SCIENTIFIC AMERICAN, INC.

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