Ligne gauge, clock oil, crystal material
A small sharp knife used to sharpen peg wood. Any small pocket knife will suffice as a substitute.
A small ligne gauge is usually obtainable from your supply house. It is handy to measure the diameter of movements to determine the size; however, it is not generally as accurate as the millimeter gauge.
The gauge illustrated is a common type of millimeter gauge with a vernier for subdividing the millimeters into tenths. It is used for measuring the length and outside diameter depth in millimeters. MM is the abbreviation for millimeter. Later a description will be given of the micrometer, which measures to one/one-hundredth of a millimeter.
Clock oil, while principally used for oiling pivots on a clock, is used by the watchmaker to oil mainsprings and the winding and setting parts of the watch. It should be kept covered at all times and in a dark place. It should be removed from the bottle several drops at a time and placed in an ail cup. This assures the watchmaker of having clean, fresh oil at all times. Do not add fresh oil to the oil cup without first disposing of any remaining old oil.
For the beginner, any half round object of glass or metal and about 4 inches across will serve. A smaller size is desirable for small crystals. The crystal is shaped over the former and should be formed high enough to let the hands of the watch rotate without rubbing.
Crystal material for making and forming fancy shape watch crystals is usually of plastic, the most common of which is known by the trade name PLEXIGLASS. It can be formed and polished with a minimum of effort.
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