Wilbert Smith Archives Files Box 1131 19 1131-19-p057

Document Text (OCR)

——1- a At a —————— eee were removed by scrubbing and scraping and the resultant powder examined by X-ray diffraction. The main constituent was a hydrated iron oxide as commonly found on the surface of rusty steel. There was also some silica present which could be accounted for if some of the particles adhering to the surface were sand grains. Hardness of Samples Hardness measurements made on the samples gave values of from 134 to 142, average 138 VPN (74 Rockwell B) for the magnetic material...