lug form a universal joint, so that the blow-pipenozzle can be brought into any desired position. Thenozzle can be swung up and down, and can be turnedwith the valve-plug. The universal joint dispenseswith the usual rubber-hose. Judging from published reports, the use of second-handboilers by small… … Model Showing Method of Operation.ELECTRIC HOIST INSTALLED ON THE COMSTOCK. ELECTRIC HOISTS ON THE COMSTOCK. BY LEON M. HALL. With the advent of electricity on the Comstock itbecame necessarj to take up the problem of hoistingfrom considerable depths by means of electrical en-ergy, and after much…
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