Dry plates, ranging in rapidity from . one-tenth to one-twentieth the time necessary for a wet collodion plate, are now commonly used in the studios of this country. Of course, plates of such extreme sensitiveness require great care in handling, and absolute freedom from any umpremeditated exposure to white light is necessary to their successful use.

It is therefore necessary that the dark room should be remodelled to suit the requirements necessary to the successful handling of such extremely rapid plates, and in this connection it is proposed to describe the necessary changes and alterations.

Any ordinary dark room may with little expense be fitted for dry plate work. First see that every chink or crevice which might admit white light is stopped or filled up, then fit the door or doors so that they will shut tight and remain closed.

For convenience of access to the room while work is proceeding, and for greater safety, it is well to erect a small porch or ante-room at each door, the entrance to which should be at right angles with the dark room door. The door to this porch and the dark room door should be fitted with springs to keep them closed. With this arrangement one can have access to the dark room at any time by closing one door before opening the other.

If the dark room is lighted by a window, it should be glazed with dark red orange glass, and if the exposure is toward the sun, it should be shaded with a green or ruby colored shade on a spring roller. If the sun never shines in the window, the shade is not necessary.

If the room is lighted by artificial light, the best way is to cut an opening in the wall or partition at the most convenient place, make a frame to fit or cover this opening, that will raise or slide, glaze it with red orange glass. On a shelf outside the opening place your gas-burner or lamp, with a large reflector behind, so as to reflect all the light through the glass into the room. If gas is used on the outside an argand burner will be the best, with a common white glass chimney for ordinary work, but for the most sensitive plates a lightgreen or thin ruby chimney will be absolutely safe. . If a kerosene lamp is used, the common white chimney with full flame will be safe; and being outside, the room will not be heated by its flame, nor rendered offensive by its smoke and odor.

In front of the window or of the artificial light, erect a shelf or place a small table with a level top, which will support the developing dishes and bottles of developing solution, and on which the work of development may be carried on.

If the room is so situated that neither window nor gas may be used in the manner suggested, then procure Carbutt's Developing Lantern, which is a most convenient lantern, not only for developing, but for other purposes. See figure.

The dark room should be supplied with running water, and the more generous the supply, the better, as a dry plate requires much washing, and a large stream will do the work much quicker than a small one.

In many instances, however, where running water may not be had, the washing box may be used with advantage. If running water is used, be careful not to use too much pressure; by attaching a rubber hose to the faucet and passing it over a nail or hook above, the pressure may be reduced so that a full but gentle stream falls upon the plate.

Safe closets should be provided to contain all sizes of plates; or the new

Washing Box

Washing Box.

Negative Boxes

Negative Boxes.

Made by Anthony & Co., may be used instead, both for unexposed and for exposed plates awaiting development.

The dark room should be supplied with the necessary apparatus, such as developing trays, which are of japanned tin, of glass or india rubber; see cuts, Japanned Iron Developing Tray, Anthony's Glass Trays, or the patented article, the Glass Bottom Dry Plate Developing Trays. And also the dishes to contain the fixing solutions. which may be trays or upright, like silver-bath dishcs is a capital dish to contain the hypo and clearing solutions and is not expensive, and can be had of all sizes. All these dishes should be kept scrupulously clean when not in use.

Japanned Iron Developing TrayAnthony's Glass TraysGlass Bottom Dry Plate Developing TraysThe Common Sense Tray

The Common Sense Tray.

Developing Room For Dry Plates PhotographyInStudioAndField 8

There should be Graduates of the 16 oz. and the 8 oz. sizes, and also a minim glass measuring up to one fluid ounce, also one or more of Anthony's Combined Funnel and Filter, for filtering the various solutions.

Anthony's Combined Funnel And Filter

Anthony's Combined Funnel And Filter.

There should be glass-stoppered bottles for containing the developing solutions, especially the pyro; also racks to hold the plates while drying; one finely adjusted scale with apothecary weights weighing to a ΒΌ lb.; one camel's hairbrush, 3 inches wide, for dusting the plates before putting them in the holders for exposure, and also for removing sediment from the surface of the film after fixing and washing.

Folding Negative Rack

Folding Negative Rack.

Thus fitted and furnished, the dark room is ready and well adapted for the most difficult dry plate work, and we will now proceed to the consideration of the Development Of Dry Plates.