Cyclopedia of architecture, carpentry, and building : a general reference work ... (1907)
American School of Correspondence · Chicago : American Technical Society · leaf 305
plate iron, which is loweredto the bottom with a crane. The box is so constructed that on reach-ing the bottom a latch operated by a rope reaching to the surfacecan be drawn out, thus permitting one of the sloping sides to swingopen and allow the concrete to fall out. The box is then raisedand… … 55 , Z tc ^H c» S c3 (11 (i| U s c3 a. a) H ■I.J ir. W3 Ph C3 •< ■4^ o •—t M •l-t C t/l .c u, 3 tl O < 3 X if. ^ O 0) a fe o I- ^ U 3 a H 0 > fl ^ o H o Z •-5 r« o O
Architecture · Building · Carpentry
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