. The street railway review . e the rail through which llu- slcam shoidd pass. Fig. 24 illustrates a design for a fire escape, being amodified form of .i device Jjatenteil in 1S13 by ThomasRoberts. This principle might possibly be employed in theconstruction tower or trolley repair wagons. As will beseen, the device is constructed on the principle of the la/.y-tongs and is mounted on a four wheel carriage. At the lopis a platform with a folding bridge or gangway. The plat-form is raised by means of a pinion meshing into a pair oftoothed (piadrants which have arms welded to the lowestlever bars
. The street railway review . e the rail through which llu- slcam shoidd pass. Fig. 24 illustrates a design for a fire escape, being amodified form of .i device Jjatenteil in 1S13 by ThomasRoberts. This principle might possibly be employed in theconstruction tower or trolley repair wagons. As will beseen, the device is constructed on the principle of the la/.y-tongs and is mounted on a four wheel carriage. At the lopis a platform with a folding bridge or gangway. The plat-form is raised by means of a pinion meshing into a pair oftoothed (piadrants which have arms welded to the lowestlever bars. Motion being given to the pinion by the winchthe two (piadrants are moved in opposite directions, and theseriis of levers are opened or closed like so many ])air ofshears. A could be provided to one side and 450 ^tied5^cukciy-5^e^^ connected by cross liars and the pinions actuated by a com-mon axle. While disappointment has been the bitter fruit of manj-pioneers in this interesting branch of mechanical science,. FIG. 24—TOWER WAGON, 1S13. who shall say that the devices here illustrated have not beenstepping stones in the process of evolution, which hasbrought modern transit facilities to their present advancedstate, or that they may not yet figure in the progress whichis yet to be made, for the development is vet going on withrapid strides. A PROTECTED THIRD RAIL SYSTEM. The illustrations represent the K. A. K. third rail systemfor elevated railways and lines operating under steam roadconditions. One shows the track rail, guard rail outsideand the covered third rail, also the contact shoe in third rail is a steel angle and is mounted on fiber orother insulating material. The posts are supported on ironchairs at the outer ends of the ties and the rail is bolted to the posts, the bolt heads being counter-sinik so as not tointerfere with the contact shoe. The other is a similar construction for the application ofthe third rail to steam roads. The wood
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Keywords: ., book, bookcentury1800, bookdecade1890, booksubjectstreetrailroads
