. Railway age . ssary strength and rigidity. The part of the jack above the roof Is octagonal in section so Mahch 13, 1908. THE RAILROAD GAZETTE. 385 as to better resist wind The sliort inside diameter is36 in.; below tlie roof tlie jaclv is 24 in. square. This allows ampleventilating space for removal of the steam, smoke and gases fromthe upper part of the roundhouse. The ends of the hood aregiven a steep pitch to prevent smoke from rebounding into thehouse. The hood is 8 ft. long, G ft. high and 40 in, wide at thebottom, with 12 in. hanging sides to enclose the locomotive
. Railway age . ssary strength and rigidity. The part of the jack above the roof Is octagonal in section so Mahch 13, 1908. THE RAILROAD GAZETTE. 385 as to better resist wind The sliort inside diameter is36 in.; below tlie roof tlie jaclv is 24 in. square. This allows ampleventilating space for removal of the steam, smoke and gases fromthe upper part of the roundhouse. The ends of the hood aregiven a steep pitch to prevent smoke from rebounding into thehouse. The hood is 8 ft. long, G ft. high and 40 in, wide at thebottom, with 12 in. hanging sides to enclose the locomotive dimensions, however, can be made to suit any jacks are made by Paul Dickinson, Inc., Chicago. Strauss Trunnion Bascule Bridges. The trunnion bascule type of drawbridge is almost as old as theswing bridge, there being many early examples of it in Europe. In1839 the North Eastern of England Tjuilt a double-leaf trunnion bas-cule, which remained in service until recently. In 1807 the city of. built at Cleveland, Ohio, for the Wheeling & Lake Erie in the tallof 1905. Since then 11 additional bridges of this type have beenbuilt, are under construction, or are ordered. These include themonumental Knippels bridge at Copenhagen, Denmark, and the 170-ft., single leaf, double-track bascule bridge tor the Chicago & North-Western at Kinzie street, Chicago. The Strauss designs embrace a number of modified forms oftrunnion bridge, all intended to increase economy and principal features are the pivoted counterweight and the parallellink mechanism, which apply to both the overhead and underneathcounterweight types illustrated herewith. The following are someof the claims made: It was the first bascule bridge in which a con-crete counterweight was substituted for cast iron. It is the onlybascule which is exactly balanced, and, being at the same time posi-tively connected to the foundations, it is free from any danger other-wise attendant on the erection
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Keywords: ., bookcentury1800, bookdecade1870, bookidrailwayage44, bookyear1870
