. The half-tone process. A practical manual of photo-engraving in half-tone on zinc, copper, and brass. one which will enable the screen effectto be seen readily. Penrose and Co. make a littlemicroscope for the latter purpose called The Midget(fig. 27). On the Continent thereare several of these small micro-scopes on the market, notably TheVagus. Steinheil and Zeiss alsomake instruments of this high powers are quite ob-jectionable for ordinary focussing,as they magnify the grain of theimage and the grain of the groundglass to such an extent as tomislead the operator. The remaining r
. The half-tone process. A practical manual of photo-engraving in half-tone on zinc, copper, and brass. one which will enable the screen effectto be seen readily. Penrose and Co. make a littlemicroscope for the latter purpose called The Midget(fig. 27). On the Continent thereare several of these small micro-scopes on the market, notably TheVagus. Steinheil and Zeiss alsomake instruments of this high powers are quite ob-jectionable for ordinary focussing,as they magnify the grain of theimage and the grain of the groundglass to such an extent as tomislead the operator. The remaining requirements area large focussing cloth of soft,opaque black material, and a rulethe size of image. Transparent celluloidrules are good for this purpose, as the image can beseen through them. A box of drawing pins should alsobe provided for fixing the copy on the board. Theseshould have a large head, and be capable of being easilypulled out. Unmounted prints, cuttings from books and news-papers, and pieces of fabric, are best placed in a lightbox pattern printing frame with plate glass front, which. Fig. 2/ for measurin; THE STUDIO. 71 is hung in front of the copy-board. This keeps thecopies fiat, and the photographing through glass is nodetriment, provided the lighting is arranged so thatthere are no surface reflections. The only other articles needed for the equipment ofthe studio are the ruled screens, and the importanceof these essential parts of a half-tone outfit is sufficientto warrant a special chapter. CHAPTER IV. THE DAR K ROOM. UCH of the success of half-tone work depends on having a properly appointed dark will not do to set apart some stuffy little cupboard-like room for the purpose, nor is it advisable that itshould be in a room separated from the studio by anydistance. A comparatively large and well-ventilatedroom, with its entrance situated preferably at that pointof the studio nearest to the back of the camera, isrequired. About half the floor space allo
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