. The strength of materials; a text-book for engineers and architects. ^ negligible. The worm-wheel w and the casting v for the weigh-leversare bored out to receive the ends of the specimen, and are THE TESTING OF MATERIALS 391 provided with fixed keys which slide in corresponding key-ways cut in the specimen. When tubes are subjected to stressthey are provided with solid ends secured by transverse pins,thereby avoiding brazed joints, since these latter are trouble-some owing to the state of the metal being altered by thebrazing. The end of the specimen projecting through theworm-wheel is fitt
. The strength of materials; a text-book for engineers and architects. ^ negligible. The worm-wheel w and the casting v for the weigh-leversare bored out to receive the ends of the specimen, and are THE TESTING OF MATERIALS 391 provided with fixed keys which slide in corresponding key-ways cut in the specimen. When tubes are subjected to stressthey are provided with solid ends secured by transverse pins,thereby avoiding brazed joints, since these latter are trouble-some owing to the state of the metal being altered by thebrazing. The end of the specimen projecting through theworm-wheel is fitted with a lever x for applying bendingmoment, and both levers for bending may be loaded in-dependently or by a cross-bar suspended from stirrups asshown. CaPiefomelgr. Fig. 182.—Simple Torsion Meter. Torsion Meters.—The elastic angular strain in torsionrequires less magnification than the elastic longitudinal strainin tension, and so comparatively simple apparatus can beused. Fig. 182 shows a simple apparatus made by Mr. A. Macklow-Smith. Two arms a, b, connected together by an extensiblesleeve, are secured by pointed screws to the specimen. The armA carries a cathetometer or telescope and the arm B carriesan ivory scale upon which the angle of torsion is read. Professor Cokers Torsion Meter.*—This apparatus, * Phil. Mag., April 1909. 392 THE STRENGTH OF MATERIALS which can be used also for measuring the strain in combinedbending and torsion, consists of a graduated circle A, Fig. 183,mounted on the specimen b by three screws c in the chuck-plate D. A sleeve e provided with three screws grips thespecimen at a fixed distance away from the first set. Thespacing of these two main pieces on the specimen is effectedby a clamp, not sho^Mi in the fig
Size: 2075px × 1204px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1910, bookpublishernewyorkdvannostran
