Cyclopedia of architecture, carpentry, and building : a general reference work ... (1907)
American School of Correspondence · Chicago : American Technical Society · leaf 51
Fig. 11. Cross Section of Drum (front half cuut..a.. >, Showing Blades and Liniujj 38 REIXFORCED CONCRETE 29 concrete falls through a trap door in the bottom of the machine. Inthe continuous type the materials should be put in at the upper end … Fig. 12. KuLi.some Batch Mixer-
Architecture · Building · Carpentry
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