. American engineer and railroad journal . troller, whichmay be used with any standard motor, and while its design isradically different from the ordinary type of controller, itssize and external appearance are much the same, as will benoted by reference to the illustrations. Its principal advan-tages are the uniform and minute gradations of speed whichit furnishes over a wide range, the ability to stand abuse undersevere usage, its economy of operation, and the fact that themotor maintains its speed regardless of the load and that thetorque is constant at the lower speeds over a range of abou
. American engineer and railroad journal . troller, whichmay be used with any standard motor, and while its design isradically different from the ordinary type of controller, itssize and external appearance are much the same, as will benoted by reference to the illustrations. Its principal advan-tages are the uniform and minute gradations of speed whichit furnishes over a wide range, the ability to stand abuse undersevere usage, its economy of operation, and the fact that themotor maintains its speed regardless of the load and that thetorque is constant at the lower speeds over a range of about 3to 1, which is obtained by changing the effective voltage at themotor. This range of 3 to 1 may be increased by the addi-tion to the system of field control, thus permitting a range ofspeed of from 3% to 1 up to 5 to 1, and even higher ratiosin special cases. The principle of the system consists, briefly, in the inter-mittent connection of the working circuit .with the supplycircuit. That is. in a cycle of operation, the supply circuit. FIG. 1- -Hi. 11 PI \. Kill OCKAT. STACK DESIGNED ACCORDING TO AMERICAN ENGINEEB suits of which have thus far been very successfully applied onthis road. The stack is shown in one of the illustrations. Theboiler has an outside diameter of 70 ins. and lias the gussetbracing, characteristic of the Brooks works. Tate flexiblestay bolts to the number of 174 are used in the front and backcorners of the fire box, all the throat stays and a number inthe back head being of this variety. These locomotives have322 :•, in. tubes 19 ft. 6 in. long, with 13-16-in. bridges and3 1-16-in. space at the back tube sheet. The spaces at thefront tube sheet are 3 ins. Each engine is fitted with threestandard blowoff cocks, one in each side and one in frgnt of thefirebox. It is noteworthy that these locomotives weigh practicallythe same as the largest freight engines on this road, whichwere illustrated on page 12 of the January number, locomoti
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectrailroadengineering
