om cial construction and is adjustable so as to hold any the plate. The glass is placed in powerfularce focusing lamps are available, the latter being used a specially designed ‘‘ squaring chiefly on cloudy days. frame” having. squared metal The first: step in the produc- edges, and after adjusting… … box is then firmly-secured to the which will be readily. understood by reference to’ the engraving. bed by a turn of a binding screw Pollehing. Etching. The clamped plate is hung face and the image is brought into downward toward the floor in sharp focus on the ground glass. The photographer is now…
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