The SciencesWhen Bores Must be HardenedElectro-Magnetic Induction Process Provides a Means of Improving Wearing SurfacesBy A. P. Peck on August 1, 1941AdvertisementABOUT THE AUTHOR(S)Recent Articles by A. P. PeckPreviews of the Industrial HorizonPreviews of the Industrial HorizonPreviews of the Industrial Horizon