Abutment — In coal mining, (1) the weight of the rocks above a narrow roadway is transferred to the solid coal along the sides, which act as abutments of the arch of strata spanning the roadway; and (2) the weight of the rocks over a longwall face is transferred to the front abutment, that is, the solid coal ahead of the face and the back abutment, .
Slat originally envisioned one massive boom, more than 60 miles long, blocking trash in the middle of the gyre, with ships arriving occasionally to haul away the mess. — james rainey /, NBC News, "A young Dutch inventor wants to clean plastic from the ocean.
A trommel screen, also known as a rotary screen, is a mechanical screening machine used to separate materials, mainly in the mineral and solidwaste processing industries. It consists of a perforated cylindrical drum that is normally elevated at an angle at the feed end. Physical size separation is achieved as the feed material spirals down the .
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Withdrawn Standards. ANSIZ4199 American National Standard for Personal Protection Protective Footwear. A4 Withdrawn 1965: Specifiion for .
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