. The silver sunbeam : a practical and theoretical text-book on sun drawing and photographic printing. « 33» Whatever may be thecause of this trouble, itmay be remedied by flow-ing the plate, after beingwashed, with a weak so-lution of gum Arabic, saytwenty grains to theounce of water. Slipping of the Film.âImmersing too soon in thebath. A very acid silverbath. An acid surface ofthe glass. A solution ofalbumen will prevent theabove irregularities. 7. Want of Sharpness. Taking it for grantedthat the operator is supplied with a good lens, care must betaken to keep the position of the glass in t
. The silver sunbeam : a practical and theoretical text-book on sun drawing and photographic printing. « 33» Whatever may be thecause of this trouble, itmay be remedied by flow-ing the plate, after beingwashed, with a weak so-lution of gum Arabic, saytwenty grains to theounce of water. Slipping of the Film.âImmersing too soon in thebath. A very acid silverbath. An acid surface ofthe glass. A solution ofalbumen will prevent theabove irregularities. 7. Want of Sharpness. Taking it for grantedthat the operator is supplied with a good lens, care must betaken to keep the position of the glass in the shield identicalwith that of the ground _. _. glass, otherwise the pic-ture will lack case the lenses havebeen taken out andcleaned, they must beput together again intheir proper arrangement of thedifferent parts of an ob-jective can be seen byreferring to page 561. Intaking views, shakingof the box will causelack of sharpness. Asthe moving of the boxis likely to be causedsolely by a strong wind,operators should becareful to have a verystiff tripod for this 552 DEFECTS AND BEMEDIES. 8. Streaks Fig. 35.
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