. The street railway review . otormen attend to it. The cut shows a device invented byJ. B. Knudsen which has worked quite successfully on oneof the cars on the Lake Street Elevated for some time past. The upper part of the cut represents a plan view of thedevice with a cross section of the controlling valve. Thevertical cylinder is connected at the bottom to the air reser-voir. To get a differential spring action so as to give amaximum and minimum pressure a spring is behind the pis-ton and fastened to the spindle between two nuts is a phos-phor-bronze disc. In the horizontal cylinder is a pi
. The street railway review . otormen attend to it. The cut shows a device invented byJ. B. Knudsen which has worked quite successfully on oneof the cars on the Lake Street Elevated for some time past. The upper part of the cut represents a plan view of thedevice with a cross section of the controlling valve. Thevertical cylinder is connected at the bottom to the air reser-voir. To get a differential spring action so as to give amaximum and minimum pressure a spring is behind the pis-ton and fastened to the spindle between two nuts is a phos-phor-bronze disc. In the horizontal cylinder is a piston andattached to it is a spring whose tension is a little less thanthat of the spring in the vertical cylinder. The piston rodis connected to the contact piece, but insulated with a blockof fiber. This brass contact piece is pivoted to a porcelainplate and at the lower en<l is a spring which holds it inproper position. The connections to the mains are as above the point of contact is an air nozzle which is at. moves towards the left it causes the vertical spindle to riseand open the valve in the air pipe. When the mechanism is in the position shown in the cutthe circuit is closed and the motor and air pump are workingwith the pressure in the reservoir increasing. As soon asthe air pressure reaches the designed maximum it overcomesthe tension of the spring and diaphragm in the vertical cyl-inder and raises the piston which opens the ports and theair passes into the horizontal cylinder. This forces the pis-ton of the horizontal cylinder to the left which breaks thecontact and stops the motor. The air from the nozzle blowsout the arc. For service on the elevated road the springsand diaphragm are set for a maximum of 60 lbs. and mini-nuim pressure of 52 lbs. LOW OPERATING EXPENSES. In regard to the operating expenses of the Calumet Elec-tric Railway, Chicago, published in the March Review,page 176, one of our readers requests information as tonumber of cars operate
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Keywords: ., book, bookcentury1800, bookdecade1890, booksubjectstreetrailroads
