. The half-tone process. A practical manual of photo-engraving in half-tone on zinc, copper, and brass. Fig. 18. I). 5° THE HALF-TONE PROCESS. bottom of the camera body, and erecting the screenholding frame upon it. The slide is moved by acentral lever operating a finger piece under the will pull it to and fro with a quick movement,whilst a micrometer screw operating against the slidingpiece provides for a slow and fine movement. Klimsch uses a similar slide, but operates it by ahorizontal linked lever from the side. Voirin adopts the same form of slide, but operates itby a screw. F
. The half-tone process. A practical manual of photo-engraving in half-tone on zinc, copper, and brass. Fig. 18. I). 5° THE HALF-TONE PROCESS. bottom of the camera body, and erecting the screenholding frame upon it. The slide is moved by acentral lever operating a finger piece under the will pull it to and fro with a quick movement,whilst a micrometer screw operating against the slidingpiece provides for a slow and fine movement. Klimsch uses a similar slide, but operates it by ahorizontal linked lever from the side. Voirin adopts the same form of slide, but operates itby a screw. Falz and Werner use the .base, plate slide in much thesame way, and operate it by a pinion rod, with knob onthe side of the camera. Strivens, and also Watson, arrange a pair of bevelledcog wheels in each of the four corners of the screenholder, and operate these simultaneously by means ofconnecting pinions ending in a knob on the outside ofthe camera. In a camera patented jointly by Penrose and Brown,in 1899, there were four cams attached to two rodsplaced near the top and bottom of the screen-holder,the rods b
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Keywords: ., bookcentury1900, bookdecade1900, bookidhalftoneproc, bookyear1904
