File:Annual report of the Regents (1900) (14778929465).jpg

Identifier: annualreportof5421900newy (find matches)
Title: Annual report of the Regents
Year: 1889 (1880s)
Authors: New York State Museum University of the State of New York. Board of Regents
Subjects: New York State Museum Science
Publisher: Albany : J.B. Lyon, State Printer
Contributing Library: Smithsonian Libraries
Digitizing Sponsor: Biodiversity Heritage Library

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the former. A pug mill, according to its size, will in 10hours temper clay enough for from 25,000 to 60,000> brick. Pugmills take up less room than ring pits and do not require as muchpower to operate them. They will also, if desired, discharge theclay directly into the molding machine. They are used chiefly withstiff mud machines. In some works a double form of pug mill is used. This has twoaxles bearing knives, instead of one. They revolve in opposite di-rections, (pi. 106^^) Screens When clay is molded in the dry condition, or when shale is usedinstead of soft, plastic clay, it is important that the material be firstground to the proper degree of fineness. As the material comes from the dry pan or other apparatus usedto pulverize it, it is carried to screens, which allow the sufficientlyfine material to pass through while those particles which are toocoarse go back to the crushing machine. Three general types of machine are used, inclined, rotary, and 8 CD aboojP. O) od «M o d
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