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This process may be useful to carvers and wood engravers not only to those who cut the fine objects of artistical design, but still more to those who cut patterns and blocks for lace, muslin, calico-printing, paper hangings, etc., as by this means the errors, expense and time of the draughtsman may be wholly saved, and in a minute or two the most elaborate picture or design, or the most complicated machinery, be delineated with the utmost truth and clearness. CHAP. IX. CALOTYPE AND CHRYSOTYPE. The materials and apparatus necessary for the Calotype process are-- Two or Three Shallow Dishes, for holding distilled water, iodide, potassium, &c.--the same water never being used for two different operations. White Bibulous Paper. Photogenic Camera--Fig. 9. Pressure Frame--Fig 29. Paper, of the very best quality--directions for the choice of which have been already given. A Screen of Yellow Glass. Camels' or Badgers' hair Brushes:--A seperate one being kept for each wash and solution, and which should be thoroughly cleansed immediately after using in distilled water. That used for the gallo-nitrate is soon destroyed, owing to the rapid decomposition of that preparation. A Graduated Measure. Three or Four Flat Boards, to which the paper may be fixed with drawing pins.