. The strength of materials; a text-book for engineers and architects. Fig. 177.—Thurstons Torsion Testing Machine. The specimen x is gripped between special three-jaw chucksg, g, and the torque is applied from a hand-wheel i through aworm-wheel h mounted upon an adjustable standard a*. Thetorque is thus communicated to a lever / and thence through asupplementary lever k and rod I to the steelyard b, upon whichthe usual jockey d is mounted. 384 THE STRENGTH OF MATERIALS The main torsion lever / is fulcrummed on ball-bearings /^.Passing through the centre of this bearing is a spindle e of cruci
. The strength of materials; a text-book for engineers and architects. Fig. 177.—Thurstons Torsion Testing Machine. The specimen x is gripped between special three-jaw chucksg, g, and the torque is applied from a hand-wheel i through aworm-wheel h mounted upon an adjustable standard a*. Thetorque is thus communicated to a lever / and thence through asupplementary lever k and rod I to the steelyard b, upon whichthe usual jockey d is mounted. 384 THE STRENGTH OF MATERIALS The main torsion lever / is fulcrummed on ball-bearings /^.Passing through the centre of this bearing is a spindle e of cruci-form section to which the chuck g is attached. This spindleis connected with the lever / by means of rollers e^ wherebyit has limited longitudinal movement through the lever, butcannot revolve therein. This longitudinal distance is to allow. Iflb Fig. 178. of adjustment due to the shortening of specimens undergoingtests, the collar e^ on the spindle e preventing the withdrawalor extended movement of the spindle. The main lever / isprovided with knife-edges p and /^ through Avhich connectionis made to the supplementary lever k; this lever k is w ithinthe main lever / and has a ball-bearing fulcrum k^ on a bracketa^. It is suspended by means of the link m from the knife-edge /2 of the main lever, and at its opposite end it is connectedwith the knife-edge of the main lever P by a link m^. The linksm and m^ connect with the lever k through Imife-edges k^ andP. Between the knife-edge P and the ball-bearing k^ isanother knife-edge n which forms the connection from thelevers / and k to the steelyard b by means of the rod Z. The THE TESTING OF MATERIALS 385 lever / is counterbalanced by the adjustable weight /*, and thelever ^ by a similarly arranged weight k^. Assuming the torque to be applied as indicated by the arrowy, it lowe
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Keywords: ., bookcentury1900, bookdecade1910, bookpublishernewyorkdvannostran
