The Dictionary Of Photography

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

Home | About | Photography | Contact






Reversed Negatives
front glass of lens. All the surfaces except c c are enclosed in brass-mounting, but the surface h, opposite to the right angle, must not touch the glass, e is a shutter for exposing ; f, f, the screws for clamping same. The third method is by taking negatives through the glass. The most convenient way of doing this is to have a piece of glass of the same thickness as used for the plate ground on one side, and the ground surface placed outside, just the opposite way to the usual focussing screen. The back of the plate must be carefully cleaned, and should be inserted in the dark slide, with the glass towards the shutter of slide. Care must be taken that the spring used to keep the plate in position does not injure the fikn.
Second method of procedure : By reversing the negative film itself. This is comparatively easy, and can be done as follows: - The negative is taken and developed in the ordinary way, washed andMried, and is coated with a solution of india-rubber in benzole, and when dry coated with transfer collodion made as follows: -
Pyroxyline............
Castor oil
Methylated spirit, '805 ......
,,         ether, 730 ......
24 grs. 24 mins.
2 ozs.
I oz.
And allowed to dry, and placed in a bath of
Hydrofluoric acid ... ......... 1 drm.
Distilled water         ............10 ozs.
562