It is well to avoid using acetone near an open flame, as its vapor is highly flammable.Īcetylene – A colorless gas, C2 H2, highly flammable. Also, an adhesive for some plastics.Īcetone – A liquid used as an ingredient in solutions for cleaning watches, and as a solvent for resins and fats.
A turning fork replaced the traditional balance wheel and hairspring, its vibrations being converted mechanically to rotary motions and transmitted through a gear-train to the hands.Īcetin acid – A form of vinegar used for purposeful erosion of steel parts such as broken screws from watch parts. It disappears naturally as the balance and its spring continue in use.Īccuform – Trade name for refractory material for holding parts in position during soldering.Īccumulator – A condenser for storing electrical energy, used in electrical clocks and watches.Īccutron – (Ac’ cu’ tron’) Brand name for the sonic timepiece introduced by Bulova Watch Co. This peculiarity is explained to variously by authorities to be considered well understood. See also D.C.Īcceleration – A gaining rate superimposed on the regular rate of a time-piece, particularly of new marine chronometers during their first year’s service. It must be employed for demagnetizers, and for electric clocks that are driven by public service current. – Abbreviation for alternating current electricity which reverses direction at a stated rate (cycles) per second- for example “60 cycles A.C.”. The specific locations of these interruptions are characteristic of some gemstones and thus can be used in gemstones identification.Ī.C.
or for polishing (which is just a finer grade of grinding), fine abrasives like diamond powder, diamantine, sapphire, rouge, etc.Ībrasive points – Grinding points of various shapes, mounted on 3/32” shanks and used in flexible shaft machine for metal removal.Ībrasive wheels – Emery and diamond encrusted wheels in various binders, used on mandrels in flexible shaft machine for metal removal and finishing.Ībsorption band – Dark lines interrupting the spectrum as viewed through a spectroscope. Aa – former industry term for a quality of silver plate equivalent to 3 Troy ounces of silver per gross of teaspoons also known as medium.Ībalone pearl – (a-bal-o’ nee) Pearl from an abalone, usually showing the iridescent colors characteristic of the interior of its shell.Ībrasive – Any material used for grinding, emery, oilstone powder, carborundum, levigated aluminous oxide, etc.
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