he transmitted by means of a worm to the hoisting gear, the idea being to make magnetic brake is obvious. If from any reason during working operations, the the crane self-sustaining without the use current should fail, the brake lever of a brake. Experience has proved would be instantly released,… … A 15-TON 47-FOOT SPAN ELECTRIC CRANE. BUILT BY MESSRS. JOSEPH ADAMSON & CO.
Engineering
Internet Archive · Smithsonian Libraries · Public domain (published before 1931). Free to use for anything.
