A RAILWAY DYNAMOMETER CAR.

S, end of cross springs through which tho tractive pull is transmitted to the car. W, wheel for measuring speed and imparting motion to certain apparatus in the car.

THE ever-increasing need for efficiency and economy in railway working de mands the collection and co-ordina tion of facts and figures whereby the behaviour of locomotives and rolling-stock under varying conditions may be recorded scientifically. Hence the introduction of the dynamometer, or power-measuring, car, equipped with a whole battery of apparatus, which shows, by means of gauges and lines drawn on paper, the degree of forces, speeds, and other matters under consideration.