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� more face than if run with a belt. }Ir. Lamb runs should rise to the surface. This plan for part ially two gangs, each with a pulley of about U inches face purifying water before it is admitted to boilers is wel l and 3 teet diameter. A mulay or rotary sawmill can worthy ot attention. -EDe. --�-------be run with a friction pulley of 12 to 16 inches face.doi:10.1038/scientificamerican10221864-262 fatcat:ynomcog7azgl7ocv6iq3wdokt4