Robinson, H. P. (Henry Peach), 1830-1901, author, Abney, William de Wiveleslie, Sir, 1843-1920, author, Piper & Carter, publisher · London : Piper & Carter · leaf 121
109 DRYINGr THE PRINTS. tightness by the point of a lead pencil. Move the pencil guided by the cotton, taking care to keep it upright. The resulting D … Fig. 30. figure will he an ellipse. Modifications of this figure may be made by making a second knot beyond the first knot, and placing the point of the pencil in the loop formed. When the figure has been traced in pencil on paper, it should be carefully cut out with a sharp penknife, and placed on…
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