A Manual Of Photography

 258 PRACTICE OF PHOTOGRAPHY. operator to judge of the progress of the operation. When the plate has obtained the required colour, the glass cover is pushed in, so as to cover the iodine pan, and the cover over the bromine pan is withdrawn. The plate is now removed from the iodine box and placed over the bromine box, and the colour observed as before. When the plate has received the proper amount of bromine, which is perceptible by the colour, the cover of the bromine pan is pushed in, and the plate is again placed over the iodine pan for a few seconds, until the ultimate colour required is produced, and it is then ready for removal to the camera. d. Improved Mercury Box, of walnut, with sliding legs, iron cistern, glass windows for inspecting the development of the picture, mounted with thermometer for ascertaining the tempera- ture of the mercury ? e 6 Are plate holders, with clamp for securing the same. /. Is a box for holding the daguerreotype plates. À. A levelling stand, used in the fixing process, see page 251. h. A flat peculiar dish for washing, see fig. 1, page 14. i. Is a hand-buff. The pictures being completed, they are mounted in morocco or ornamented cases, such as are shown below.