By Henry G. Abbott
Back in all its unique status Abbott's American Watchmaker and Jeweler continues to be the final word source for watchmaking and jewellery craftsmanship. No point of the exchange is going exposed during this exceptionally American method of those old methods, prepared to be the suitable advent to studying the instruments, elements, and their makes use of, passed down for plenty of generations.Here you can find hundreds and hundreds of drawings, descriptions, and diagrams of many different types of escapements, whole instructions for making staffs, innovations for detoxing, pickling, and sprucing every kind of metals, an entire checklist of valuable phrases, and lots more and plenty more.For years Abbott revised this unequalled paintings, consulting the simplest professionals to supply the main actual and finished textual content. this is the ultimate reference, instantly from an period of dignified pros and severe craftsmen.
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Extra info for Abbott's American Watchmaker. An Encyclopedia for the Horologist, Jeweler, Gold and Silversmith
An alloy of copper and tin, in proportions varying from 66 to 80 per cent, of copper and the balance of tin. Brass. An alloy consisting of about 65 parts of copper to 35 parts of zinc. This proportion is varied according to the uses to which the alloy is to be put. See Bronzing, Plating and Coloring Metals. Brittania. 78 of copper and 2,91 of zinc. Chrysorine. This alloy is sometimes used for watch cases and parts of the movement. In color it closely resembles 18 to 20 carat gold. It does not tarnish when exposed to the air and has a beautiful luster.
The manipulation of the hairspring so that the long and short arcs of the balance are performed in the same time. The theory of isochronism advanced by Dr. Robert Hooke and more commonly known as Hooke's law, “as the tension so is the force,” is an axiom in mechanics with which everybody is, or should be familiar. ” Pierre Le Roy says that there is in every spring, of a sufficient extent, a certain length where all the vibrations, long or short, great or small, are isochronous, and that this length being secured, if you shorten the spring the great vibrations will be quicker than the small ones; if, on the contrary, it is lengthened, the small arcs will be performed in less time than the great ones.
Alloys of aluminium and zinc are very hard and take a beautiful polish. An alloy of 97 parts of aluminium and 3 of zinc gives a result that is as white as the pure metal, harder than aluminium and very ductile. Artificial Gold. A metallic alloy, at present very extensively used in France as a substitute for gold is composed of: Pure copper, 100 parts; zinc, or preferably tin, 17 parts; magnesia, 6 parts; sal-ammoniac, 3 to 6 parts; quicklime, 1/8 part; tartar of commerce, 9 parts, are mixed as follows: The copper is first melted, and the magnesia, sal-ammoniac, lime and tartar are then added separately and by degrees, in the form of powder; the whole is now briskly stirred for about one-half hour, so as to mix thoroughly, and then the zinc is added in small grains by throwing it on the surface and stirring until it is entirely fused; the crucible is then covered and fusion is maintained for about 35 minutes.