act with each for performing operations hitherto done by hand labor. To rods,running through the tie blocks and riveted at each end, other, when the windlass is set in motion, drawing up the this valuable category of apparatus, the manufacturers by which means the entire structure is rendered per-… … The barrel is thus le- ordinary car. The veled and held in po- carrying capacity of sition while the hoop this car is set at 20tuns. Theordinary platform car weighs or head truss hoop. This apparatus is very rapid in its ope- drivers force all the truss hoops to their places. The about 6 tuns, and…
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