The wonders of modern mechanismA résumé of recent progress in mechanical, physical, and engineering science . travel-ling-contact is mounted on a trolley carriage, running inthe slot, and detachably connected with the car-truck. The?conduit—which is twenty inches deep and fourteen wide—can be inspected at any point by moving one of the detach-able slot-rails. There are also man-holes at distances of ahundred feet. The cars are arranged as for a trolley road—in fact, they are also used with an overhead trolley onanother part of the same line. The Smith conduit—at Blackpool, England—was com-plet
The wonders of modern mechanismA résumé of recent progress in mechanical, physical, and engineering science . travel-ling-contact is mounted on a trolley carriage, running inthe slot, and detachably connected with the car-truck. The?conduit—which is twenty inches deep and fourteen wide—can be inspected at any point by moving one of the detach-able slot-rails. There are also man-holes at distances of ahundred feet. The cars are arranged as for a trolley road—in fact, they are also used with an overhead trolley onanother part of the same line. The Smith conduit—at Blackpool, England—was com-pleted the present year, and it is too early to say muchabout its success, but the management say that it is entirelysatisfactory. They make use of a central conduit and slot,which is set on chairs of cast iron at distances of three 214 WONDERS OF MODERN MECHANISM. feet, the whole resting in a bed of masonry. The conduitis the smallest in use, being only six bv ten inches. Thesides are of wood and the slot-rails of steel. Instead ofusing wires for conductors, small slotted tubes are hung Fig. THE BLACKPOOL CONDUIT. on insulators to carry the current. The pressure 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 than
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