tions. Two addi- which the plate to be etched is mounted. Behind the tional hollow shafts are also employed, each of which table is a carriage with a rotary brush, which is also Fig is likewise formed in two sections. The three hollow driven by eccentrics, and which is adapted to passbe- shafts are… … serving to produce the points. Any desired number of rent strength is automatically regulated to conform Fig. 2.—AUTOMATIC MACHINE FOR CLEANING THE punches may be used; but in the machine illustrated, with the area of the contacting surfaces, and for plates PLATE. four punches are provided for each…
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