The Dictionary Of Photography

A True Historic Record Of The Art & Practice Of Photography 100 Years Ago.

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Emulsion
forms in use. They all have in view the inducing of a current of air among the plates generally by the burning of a gas jet in a tube or chimney. The fault of most is that the air passages are far too contracted. In many, heat is applied to the incoming air. This is quite unnecessary if the air passages are sufficiently large and well arranged, and if the box can be placed in a fairly
dry place. It is, moreover, the greatest mistake to use artificial heat in drying plates, if it can possibly be avoided, as they are rendered distinctly slower thereby.
"We illustrate (fig. 51) a form of box which has been in use by the writer for several years, and has given complete satisfaction. It will be seen that the air enters at the top of the box. It is drawn into an
air chamber at its lower portions, and hence passes up the large tube with a gas flame burning in it. This tube must be carried either into the open air or into a chimney. The plates are placed in racks, which were first designed by Mr. G. F. Williams. A sketch of one of these is given (fig. 50). Two plates may be placed back to back in each pair of notches if desired. The racks may be placed on the cross rods shown in the box, the height of which may be adjusted to suit various - sized plates." As an alternative method of drying plates, the following may
be adopted, and it is one which
Fig- $ti
personally I prefer to that sug-gested by Mr. Burton. All that is required is an air-tight box and some anhydrous calcium chloride. The plates to be dried should be merely placed in racks in the box, and a porcelain dish, as large as the box will hold, in the bottom. In the dish place the anhydrous chloride of calcium, put the dish in the box, the racks containing the plates, and shut the door, or lid, and leave for three days, by which time the plates should be
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