. American engineer and railroad journal . it iscalled, water toughened. We see that, while the elonga-tion of the metal in its natural state is usually below .i percent., that of the water-toughened material rises occasionallyto 50 per cent. Fig. 6 illustrates in like manner the influence of suddencooling or water-toughening on the tensile .strength. We notethat, while the tensile strength of the metal in its natural state,as indicated by the black semicircles, rarely rises above100,000 Ihs. per square inch, that of the water-toughenedmetal, indicated by the circles, is usually above 110,000
. American engineer and railroad journal . it iscalled, water toughened. We see that, while the elonga-tion of the metal in its natural state is usually below .i percent., that of the water-toughened material rises occasionallyto 50 per cent. Fig. 6 illustrates in like manner the influence of suddencooling or water-toughening on the tensile .strength. We notethat, while the tensile strength of the metal in its natural state,as indicated by the black semicircles, rarely rises above100,000 Ihs. per square inch, that of the water-toughenedmetal, indicated by the circles, is usually above 110,000 lbs.,and rises to even above ,000 lbs. per square inch.(to be continued.) known among American engineers as it deserves, and we there-fore present a detailed description of it. The hydrometric ajiparatvis of Arasler-Ijaffon consists ofthree distinct parts : 1. Tiie mill, wilh a registering apparatus and the electriccontact. 2. The electric signal, with its battery and conductors. 3. The winch, with weight for working at great CROSSINGS OF GREAT RIVERS. A CONTRIBUTION TO RAILROAD LOCATION. By a. Zdziahski, THE HYDROMETRIC APPARATUS OF AMSLER. As we have said in the chapter on the Measurement ofVelocities.* the most suitable apparatus for measuring thevelocities of current at different depths is the hydrometricapparatus of Amsler, or more of .T. Amsler-LalTou ofSchaffhausen. We do not think that this apparatus is as well * See and Enoinkering .JounNAi., September, WJi, p. 403. 1. The Mill.—The mill consists of a pair of helicoidal Idades(figs. 1 and 2) fixed on a horizontal shaft, and put in rotatorymotion by the current of water. The shaft carries an endlessscrew, which by means of gearing communicates the motionto the registering apparatus, consisting of a divided wheelwith an index. The wings, gearing and counter are fixed ona metallic frame, the opposite end of which carries a plane orconical rudder. The whole is supported by me
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectrailroadengineering
