and of extreme hard-ness, and in a test of these particles itwas found that their abrading action wasvery marked. Early in the investigationit was found that the silicon of the claywas the important factor in the formationof the crystals, and subsequent investiga-tions led to the development of the… … Part Sectional View of Carborundum Furnace. haustive comparative tests ; but it is stated by themanufacturers that it possesses eight times the efficiencyof emery, weight for weight. That is to say, that onepound of carborundum will polish eight times as muchsurface as the same weight of emery,…
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![An illustration from Current architecture: published in connection with a joint exibition [sic] held in Boston November 1916 (1916)](https://img.insideoutlibrary.com/img/200/ia-currentarchitect1916bost-128-186.webp)
