Patent for a new and improved dynamometer for locomotives. This design is "to provide a novel construction in dynamometers for indicating the traction power of locomotives" (lines 9-11). It consists in "a draw-head, a chamber containing a liquid located therein, a piston operating in said chamber, means for connecting said piston with the opposite draw-head, suitable tubing connecting with the said chamber, and a pressure-gage mounted upon or attached to the said tubing and actuated by the said liquid" (lines 29-37).