. Cassier's magazine . A SERIES OF TEN CORLISS AIR COMPRESSORS ON THE AQUEDUCT WORK. INGERSOLL-RAND CO., NEW YORK 446 CASSIERS MAGAZINE. ROCK-CRUSHING PLANT OF THE PITTSBURGH CONTRACTING COMPANY, NEWBURGH, N. Y. POWER &MINING MACHINERY COMPANY ,-. Ilflfll!;,,;!! left and passes over the same lines are continued down theaxis of the mast through the mastbottom and step to another sheave,whence they pass off to the are usually stationary, butthe portable derrick has found ap-plication on the aqueduct. An A-frame is held in position bv a coupleof timbers running from it
. Cassier's magazine . A SERIES OF TEN CORLISS AIR COMPRESSORS ON THE AQUEDUCT WORK. INGERSOLL-RAND CO., NEW YORK 446 CASSIERS MAGAZINE. ROCK-CRUSHING PLANT OF THE PITTSBURGH CONTRACTING COMPANY, NEWBURGH, N. Y. POWER &MINING MACHINERY COMPANY ,-. Ilflfll!;,,;!! left and passes over the same lines are continued down theaxis of the mast through the mastbottom and step to another sheave,whence they pass off to the are usually stationary, butthe portable derrick has found ap-plication on the aqueduct. An A-frame is held in position bv a coupleof timbers running from its top tosuitable points of attachment on theplatform of a car or truck. This isarranged a very little forward of theframe and bisects its vertical operating machinery is carriedon the car and acts as a counterbal-ance of the boom and load. Der-ricks are now made with booms andmasts of latticed steel work, but ap-parently none is used on the aque-duct. THE ROCK CRUSHERS The amount of concrete requiredfor construction work on the aque-duct is, if we include dams and thelike, considerably more than 2, cubic yards
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