which has proved to be most suitable for this particular purpose.
The paper having been placed in the printing frame, the frame is set up,
Lantern arranged for making positives by contact.
as seen in the cut, and the door in the side of the lantern opened, which permits the white light from the lamp to fall upon the surface of the negative; an exposure of from 5 to 10 seconds is all that will be necessary, even in case the negative is quite dense; a thin negative will print with less exposure, say 3 to 5 seconds, at a distance of from 12 to 15 inches from the light.
The paper when taken from the frame presents no change of surface, and must be developed in the same manner as a dry plate, to bring out the picture.
Previous to developing, lay the paper in a dish of clean water for a short time, and then transfer it to the developing tray. p196
The developing is done by the ferrous oxalate process. Solutions as follows:
| Saturated solution oxalate potash | 3 oz. |
| Saturated solution photosulphate iron | ½ oz. |
| Bromide solution (12 grains bromide of ammonium to 1 oz. water) | ¼ dram. |
| Saturated solution tartaric acid | 2 drops. |
This developer can be used several times successively until it becomes turbid. The best way is to first print and develop one print, to ascertain the proper time of exposure. Then make as many prints as are necessary, and develop them all together in a dish large enough, and with sufficient of the solution to cover them nicely. Observe carefully not to develop too far, as the resulting prints will be too dark. When the prints are developed, wash them well and fix them in a new solution of