File:Cassier's magazine (1911) (14760670811).jpg

Identifier: cassiersmagaz401911newy (find matches)
Title: Cassier's magazine
Year: 1891 (1890s)
Authors:
Subjects: Engineering
Publisher: New York Cassier Magazine Co.
Contributing Library: Smithsonian Libraries
Digitizing Sponsor: Smithsonian Libraries

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a rock be com-pletely inclosed. The three bladessimply secure a good grip, when therock can be carried. A three-bladedbucket is much better for such ser-vice than one with four blades, sincethree blades 120 degrees apart canoftener be depended upon to securethe rock in such way that all blades are in service. The load is thenmore likely to be evenly distributed.A very moderate-sized three-bladedbucket, having a capacity of over 21cubic feet, has been found equal toboulders weighing as much as 3,000pounds. This bucket was capable ofexcavating in shale, hard pan, andthe like. When one considers the foregoingqualifications he is prepared to learnthat contractors on the Aqueduct areusing both shell and orange peelbuckets. Apparatus of both classesare built by the Hayward Company,50 Church street, New York City. THE DIAMOND DRILLS The diamond is excessively hardand fully capable of dealing with anyrock that may be encountered. Veryconsiderable pressure may be put THE CATSKILL AQUEDUCT 459
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H HAYWARD BUCKET IN SAW-MILLPITTSBURGH CONTRACTING CO. -LEY, ELMSFORD, N. upon it while it is at work. But theremust be no shocks. In order that thecondition of successful operation witha diamond bit may be met it is neces-sary that the feed of the drill shallbe absolutely uniform and that it shall be very small and at times al-most microscopic in amount per turnof the drill rods. Two systems offeed are in prominent use to-day: theone is purely mechanical; the other isa hydraulic method. 460 CASSIERS MAGAZINE

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