Material handling cyclopedia; a reference book covering definitions, descriptions, illustrations and methods of use of material handling machines employed in industry (1921)
Wright, Roydon Vincent, 1876- ed, Little, John G., joint ed, Augur, Robert C., joint ed · New York, N.Y., Simmons-Boardman Publishing Co · leaf 468
Figs. 161 and 162 sliding door, counterweighted so as to slide easily up anddown is also applicable to these conditions. Some typesof open center chutes are fitted with hinged fire doors atintermediate floors (Fig. 161). Such doors close downflat against the floor and have a projecting lip which…
Hoisting machinery · Conveying machinery
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