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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1849 edition. Excerpt: ...is attached, to indicate the proper degree of heat required, which should never be raised above 170 Fahrenheit. The plate may be put into one of the frames (see Fig. 11,) over the mercury, face downwards, and examined from time to time, by simply raising it with the fingers, or a pair of plyers. This operation, as well as the others, should take place in the dark closet. Fig. 27. Sometimes, to prevent the necessity of raising the plate, an additional cover or top is made use of. It consists of a box fitted closely to the inner rim of the bath, and having an inclined top (a, Fig. 27.) The top is cut through and fitted with frames for each size of plate, like those already described, and in the back is a piece of glass (b,) through which to view the progress of mercurialization, and an additional piece (c,) on one side, colored yellow, to admit the light. The outline only of the top is here given, in order to show every portion of it at one view. The picture, being fully developed, is now taken out and examined; it must not, however, be exposed to too strong a light. If any glaring defects be perceived, it is better not to proceed with it, but place it on one side to be re-polished; if, on the contrary, it appears perfect, you may advance to the Fifth Operation.--Fixing the Image so that the light can no longer act upon it.--The following articles are required for this purpose: Two or three porcelain or glass dishes, in form, something like fig. 24. A plate support, fig. 25. Few, I believei now make use of this, although it is a very convenient article. Hyposulphite of Soda, A pair of Plyers. In Europe, they also use a drying apparatus, Fig. 27, but this, like the plate support, Fig. 27. is a matter of little consequence, and may be dispensed with....
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Book Description Morgan & Morgan, 1970. Hardcover. Condition: New. Never used!. Seller Inventory # P110871000148
Book Description Morgan & Morgan, 1970. Hardcover. Condition: New. Seller Inventory # DADAX0871000148