Practical guide to photographic & photo-mechanical printing (1892)
Burton, W. K. (William Kinnimond), author · London W. : Marion and Co., 22 and 23, Soho Square · leaf 310
O-MECHANICAL PRINTING PROCESSES 286 In addition to the press, a plate of steel is needed to receive the relief. This may, with advantage, be an inch thick, or nearly so, and must be planed and scraped up as true as a surface-plate on its upper side. It has then fixed to it bars of steel, to prevent… … steel plate, B, B, B, B are the steel bars, which may be J X I inch in section, slightly bevelled away at the inner edge as shown. ^ They are fixed with set screws. C is the lead plate about J inch thick, polished on its lower side, and smooth on both sides. The platen of the machine is made just…
