This section is from the book "Complete Self-Instructing Library Of Practical Photography", by J. B. Schriever. Also available from Amazon: Complete Self-Instructing Library Of Practical Photography.
Transferring On Watch-Case, Gold Or Silver. First, take your watch to a jeweler and have the movement removed. He will take charge of same and keep it free from dust. Then have the part of the case upon which it is intended to transfer the picture cleaned thoroughly by rubbing with a soft cloth saturated with benzole, so as to remove all grease or dirt. Great care must be exercised not to scratch the surface, as every little scratch will show on the picture. In many cases it is advisable to have the jeweler buff or polish the case before you make the transfer.
345. Coat the side of the case upon which you are going to transfer the picture with the following solution:
Heat the water and dissolve the gelatin in it. When cool, add 3 grains of chrome alum dissolved in 1/2 ounce of water. Apply this solution with a camel's-hair brush or a tuft of cotton.
346. After coating the case with the above solution, allow it to dry. While drying, trim your print neatly to the required size, and place it and the watch-case in cold water for fifteen minutes. Next, place the latter in warm water (testing 110° Fahr.), and allow it to remain there until the coated side feels slimy.
347. Take the print which you have previously marked as a guide to position (this marking is only necessary when the rubber support is used) and place it in the warm water, and bring the watch-case and print in perfect contact under the water, to prevent air-bells. Then withdraw from the water and with small pieces of blotting paper remove all surface water. With your pocket-handkerchief press print and case in perfect contact, gently rubbing from the center with the fingers, to remove all superfluous water and any possible air-bells. Then allow it to dry thoroughly. Never hurry the drying.
348. When dry, moisten the back of the print with benzole, and in a minute or two the paper can be slipped off and the picture will remain firmly attached to the metal. If the rubber support has been used, and any of this remains on the picture, it can be removed by wiping with benzole. Where the collodion support has been used, the collodion can be removed from the print with the ether and alcohol solution.