. The half-tone process. A practical manual of photo-engraving in half-tone on zinc, copper, and brass. eans of the guillotine 164 THE HALF-TONE PROCESS. (fig. 97). The circular saw has the advantage that acorner can be cut out of a large plate, whilst theguillotine must cut through the whole width. However, the guillotine makesa clean cut, whilstthe saw cut has tobe filed. By cuttingup to sizes found byexperience to be mostuseful the guillotinecan be utilised tothe best advantage. Workers in a smallway may cut up zincwith a tool known asa zinc hook (fig. 98).A deep score, guidedby a straight-
. The half-tone process. A practical manual of photo-engraving in half-tone on zinc, copper, and brass. eans of the guillotine 164 THE HALF-TONE PROCESS. (fig. 97). The circular saw has the advantage that acorner can be cut out of a large plate, whilst theguillotine must cut through the whole width. However, the guillotine makesa clean cut, whilstthe saw cut has tobe filed. By cuttingup to sizes found byexperience to be mostuseful the guillotinecan be utilised tothe best advantage. Workers in a smallway may cut up zincwith a tool known asa zinc hook (fig. 98).A deep score, guidedby a straight-edge, ismade in the zinc,which is then snapped against the edge of the zinc cutting board with permanent straight-edge canbe obtained in the form illustrated (fig. 99). Turning now to the question of power machinery,which has now become oneof the most important con-yf~siderations in the successfulrunning of commercial establishments, the choice ofa suitable location must be first dealt with. The mounting is often associated with the etchingroom in small establishments, but this is not to be. Fig 97 Fig 98. THE MOUNTING AND PROOFING. 165 advised, as the sawdust and chips of zinc and copperget into the ink or the dusting powders, or areembedded in the rollers, causing trouble. Apart fromthis, the noise of the machinery, if a full line ofmachines is run by power, is distracting to the etchers,whilst the vibration makes it difficult for the fineetchers and retouching engravers to do delicate work. If it is not possible to have a separate room a placeat least ought to be partitioned off from the etchingroom, and, if power machinery is run, it should be asfar away as possible from the studio, owing to thevibration caused. Plenty of daylight isrequired for the manipula-tion of the machines,especially the router andthe beveller. Electriclamps are also generallyfitted on or above themachines. F:g. 99. The floor should be a very solid one, and if a groundfloor is used it is much
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