The wonders of modern mechanismA résumé of recent progress in mechanical, physical, and engineering science . re is threehundred volts, the figure to which European lines areusually restricted, though that used on trolley lines in theUnited States is almost universally five hundred volts. Another conduit road is being built in AVashington,D. C, by the ISIetropolitan Railroad Company for itsNinth Street line, on plans made by Engineer A. AV. C\)n- CONDUIT ELECTRIC RAILWAYS. 215 nett. A central couduit of good size is used, and smallT-shaped rails are used as conductors, the contact ploughslidin
The wonders of modern mechanismA résumé of recent progress in mechanical, physical, and engineering science . re is threehundred volts, the figure to which European lines areusually restricted, though that used on trolley lines in theUnited States is almost universally five hundred volts. Another conduit road is being built in AVashington,D. C, by the ISIetropolitan Railroad Company for itsNinth Street line, on plans made by Engineer A. AV. C\)n- CONDUIT ELECTRIC RAILWAYS. 215 nett. A central couduit of good size is used, and smallT-shaped rails are used as conductors, the contact ploughsliding between them. The castings that form the yokebeing large and substantial, the drainage arrangements ex-cellent, and the climate of AYashington moderate, successis anticipated. The Metropolitan Traction Company of New York areequipping an experimental line on Lenox Avenue whichhas some new features. A continuous vault more thanthree feet deep extends under the whole line, having aconcrete floor and brick walls, on which the tracks rest andwhich afford support to the yokes or cross-supports. The Fig. THE LENOX AVENUE CONDtlT, NEW YORK. conduit is of sheet iron and about fifteen by twenty-fiveinches, and its slot-rails are supported in the firmest man-ner by bolting to the yoke and by occasional rods connectedwdth the rails of the track. The conductors are remark- 216 WONDERS OF MODERN MECHANISM. ably heavy, being formed of four-and-a-half-inch rails,.supported on soapstone piers at thirty-foot distances, withintervening lead insulation. The piers rest in sulphur-lined troughs, which arrangement would seem to be amplysufficient to protect them from leakage. There is a man-hole at every insulated pier, to render access easy. Verylittle moisture can enter the narrow slot, and the snowwould have to drift in to a height of over two feet beforeit reached the conducting rails. The contact-shoe slides onthe conductors. This is the first Northern road that givespromise of success
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