. Electric railway journal . d by means of the Brinell machine or thesclerescope. In the Brinell machine a hardened steel ball is pressedinto the surface of the gear or pinion to be tested, ata pressure of 3000 kg (6615 lb.), and the impressionthen made is measured with a microscope. The dimen-sions of the impression forms the basis of calculationof the Brinell hardness and the approximate tensilestrength at that point. This hardness is expressed interms of a Brinell hardness numeral, for example, 600,which represents a glass-hard steel, or 150, which rep-resents a soft steel. The Brinell test
. Electric railway journal . d by means of the Brinell machine or thesclerescope. In the Brinell machine a hardened steel ball is pressedinto the surface of the gear or pinion to be tested, ata pressure of 3000 kg (6615 lb.), and the impressionthen made is measured with a microscope. The dimen-sions of the impression forms the basis of calculationof the Brinell hardness and the approximate tensilestrength at that point. This hardness is expressed interms of a Brinell hardness numeral, for example, 600,which represents a glass-hard steel, or 150, which rep-resents a soft steel. The Brinell test may be applied togears and pinions without spoiling them. The sclerescope is an instrument adapted to test sur-faces where the Brinell machine cannot be used. It consists of a glass tube, open at one end and havingan air valve at the other end. In the tube is a diamond-pointed hammer. With the hammer at the closed endthe open end of the tube is placed in contact with thegear or pinion to be tested and the hammer is released.
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Keywords: ., bookcentury1900, bookdecade1900, bookpublishernewyorkmcgrawhillp
