Atmograph Atmospheric Action
Atmograph, Atmography. Pictures obtained or developed by the action of smoke or vapours have been called atmographs. (See Vapography).
Atmosphere in a Photograph. See Aerial Perspective.
Atmospheric Action. It must not be forgotten that deve-lopers are substances more or less ready to take up oxygen from the atmosphere, and that in so doing not only is their developing action weakened, but more or less objectionable products are formed. When a made up developer is required in considerable quantity, so as to be ready for frequent use, the device sketched below serves admirably as a protection against deterioration by atmospheric action, and yet allows small quantities to be drawn off for use as required. Let a be the top of the work bench in which is cut a hole large enough to easily admit the neck of the bottle, B, which bottle stands on a shelf, I, so trimmed at one end as to allow of the bottle being placed in position as shown. The bottle, a, may be of any required size, from a pint to a gallon or more, and it is fitted with a doubly perforated indiarubber cork (obtainable at Hancock's Rubber Works, Goswell Road). Two bent glass tubes pass through the cork as shown, instructions for obtaining and bending these being given under the article Glass (q-v.). The cork bearing the tubes having been removed the developer is poured in, and then sufficient of the ordinary paraffin oil used for lamps to form a floating layer, h, about an inch deep. The cork being placed in position, any required quantity of the developer can be made to flow out of the doubly bent tube, E, into the developing cup, F, by blowing in the tube, d. When the paraffin oil is first poured in, the tube, E, should be sufficiently immersed in the fluid to well cover the end, in order to prevent any oil entering the tube in question. When fresh developer is to be added to the contents of the bottle, a con-venient plan is to pour it through d, to which a funnel, j, is temporarily connected by an indiarubber tube, as by this means the paraffin oil is kept from the end of the tube, e. Other means of providing for this will suggest themselves, such, for example, as the precaution of closing the upper end of e with the finger when replacing it after removal. If the developer is poured in through d, the attachment of a short length of rubber tube as a mouthpiece is an obvious precaution. Another way of filling the