langed wheels, runs upon steel " Dictionary of Arts and Sciences, pub- rails laid within or upon the bridge and lished by the Society of Gentlemen, bolted securely thereto. This car is London, 1763." (See illustration on provided with a grooved drum and this page.) On the opposite page, too, double… … new, ingenious, and very effectual for AN OLD-TIME WOODEN JIB-CRANE, I763. the purposes intended. " A trial of the crane was made sev- furnished with sheaves through which eral times at Dices' Key, with an hogs- the chain runs. In some large cranes head of potash, 6000 pounds weight, the hook turns…
Engineering
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