Bits. —The beat bit to use for boring on the fronts of carriage-bodies is the German gimlct-bifc : by boring carefully with, it we can guide it in any direction we please and easily cut off the thread of any interfering screw. Cook's bit is much the best for boring carriage part ; it will cut a clean hole, and is not liable to split or check the wood.
Liquid Glue.— An excellent liquid glue is made by dissolving hard glue in nitric ether. The ether will take only a certain amount of the glue, so that the solution cannot be made too thick. If a few bits of pure india rubber, cat into scraps che size nf buckshot, be added, the mixture will, when dry, resist dampness to a considerable degreo. A Nox-DRyijJoi cement of groat tenacity useful to fastening plates of glass so a3 to exclude air, but which may be easily separated, is formed by ndcling freshly slaked lime to double the weight of india rubber, and heating to about 400° Fall, when the rubber will bo converted into a glutinous mass.
