H
Hair Spring
The spring that determines the time of vibrations of the balance. The term hair spring is distinctively American, as all other nations use…
Hair Spring Stud Index
Wathier's Self-adjusting Hair Spring Stud Index, shown in Fig. 158, is a very useful device, and by its use the watchmaker can save much…
Half Plate
A half-plate watch, as its name implies, is one in which the top-plate covers half of the pillar or lower plate, and which supports the…
Hall Mark
The stamp placed upon articles of gold and silver after being assayed by government officials. The United States government does not employ…
Hand Remover
The style of watch hand remover shown in Fig. 163 is a very nice pattern and can also be used as a roller remover and for several other…
Horological Books
The following list of books published on horology and kindred subjects from 1639 to 1850 inclusive, may prove of value to those who have a…
Hour Glass
An instrument for measuring the hours, consisting of a glass vessel having two cone-shaped compartments, from the uppermost of which a…
Hour Wheel
The wheel which turns on the cannon pinion and carries the hour hand. HOURIET, F. A noted Swiss watchmaker of the eighteenth century. He…
Hypocycloid
A curve generated by a point in the circumference of a circle when it is rolled within another circle. The proper shape for the teeth of…
Hard Solders
Under this name very different alloys are used, depending upon the metals to be united. The following table shows the composition of…
Hardening and Tempering Steel
The process of heating steel to a red heat and immediately chilling it is the same among all workmen, but the agents employed for chilling…
Hardening Liquids
If water is used for hardening, 32 deg. F. will be found about right for the sized articles hardened by watchmakers, and if the article is…
Half Open Tailstock
The half open tailstock shown in Fig. 300, is cut away so that the spindles can be laid in, instead of being passed through the holes. This…