. The half-tone process. A practical manual of photo-engraving in half-tone on zinc, copper, and brass. nsen burner is a useful ac-cessory in or near the dark room for rapidly drying offnegatives, warming negatives for varnishing, warmingsolutions, etc. A couple of plate racks, one for the clean glass andthe other for finished negatives, are necessary, and mostoperators believe there has been nothing better inventedthan the old fashioned V-shape folding rack, but itshould be of a substantial pattern. The V-shape madefixed (non-folding) is the best idea. For very largeplates something more subs
. The half-tone process. A practical manual of photo-engraving in half-tone on zinc, copper, and brass. nsen burner is a useful ac-cessory in or near the dark room for rapidly drying offnegatives, warming negatives for varnishing, warmingsolutions, etc. A couple of plate racks, one for the clean glass andthe other for finished negatives, are necessary, and mostoperators believe there has been nothing better inventedthan the old fashioned V-shape folding rack, but itshould be of a substantial pattern. The V-shape madefixed (non-folding) is the best idea. For very largeplates something more substantial is required, and therack is generally provided with a heavy base, as fig. 45. An outfit of negative glasswill be required for wet platework, and it is seldom worthwhile working any size below8^ x 6J inches. Patent plateis undoubtedly the best touse, but it is expensive. If,however, it is carefully handledin the washing and cleaningoperations it will last for a long time. There have beenseveral cheap imitations of patent plate introduced oflate, which, whilst not having the same planeness as. THE DARK ROOM. 95 patent plate, are better than the ordinary negativeglass. Flatted crown is next best, but often difficult toobtain, as the manufacture is restricted. The majorityof commercial firms use a good sheet glass, sold bydealers specially for photographic work ; this servesall practical purposes. For cleaning the glass, a lead lined wooden troughwith leaden grooves is the best thing, though has the advantage that the plates do not get scratchedand chipped, as they do in stoneware troughs, andtherefore the glass has not to be so frequently renewed. A polishing vice (fig. 46 for holding the glass plateswhilst being cleaned is very useful, as it saves the chanceof finger marks being left on the plates, which are,moreover, cleaned right up to the edges. A boardcovered with American cloth is often used for cleaningglass upon, but ithas the disadvan-tage that the un
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Keywords: ., bookcentury1900, bookdecade1900, bookidhalftoneproc, bookyear1904
