To cement leather to iron, first paint the latter with Lead colour, such as white-lead and lampblack. Soak slue in cold water until it is soft, then dissolve it in vinegar at a gentle heat, add one-third of its bulk of white turpentine, mix thoroughly, and apply hot to the painted iron. Apply the leather quickly, and press tightly in place.

For uniting leather to iron, use marine glue, which is made by dissolving 1 part of pure indiarubber in 12 parts of coal-tar naphtha. After solution is complete, add 20 parts of powdered shellac; warm the mixture gently, and stir from time to time until properly amalgamated. As the naphtha is very inflammable, the heating should be done in a steam bath in a closed pan. When made, the cement should be poured on a cold stone and allowed to set. Before applying the cement to the iron, the latter should be roughened with a file and heated. The leather also should be roughened on the back with glasspaper, drawn tightly over the iron while the cement is still pasty, and pressed into position until it becomes cold. Rubber tyre cement is practically a marine glue, and it may be obtained from most cycle-repairing depots.