D
Dead Center Chuck
By the use of this chuck, shown in Fig. 75, the work can be run on dead centers as well as by the bow or verge lathe, and the motion will…
Damaskeen
To decorate a metal by the inlaying of other metals, or by etching designs upon its surface. The embellishment of the surface of metals…
Decant
To pour off a liquid from its sediment; as the decanting of diamond powder, prepared chalk, etc. Saunier advises the watchmaker to prepare…
Demagnetizer
A machine or tool used to remove magnetism from parts of watches. There are several demagnetizers upon the market. In some of these…
Depthing Tool
A mechanical device for transferring the depthing of a wheel and pinion to a plate, and also for testing the depthing to see if it is…
Detent
That which locks or unlocks a movement; the piece of steel that carries the stones that lock and unlock an escape wheel. DE VICK, HENRY. A…
Dial
The graduated face of a time piece. Dials were first enameled by Paul Viet, of Blois, in 1635. The greater majority of American dials are…
Diamantine
This polishing agent is used extensively for polishing steel, and is a preparation of crystallized boron. It is not applicable to brass or…
Diamond Drills
Pieces or copper wire, in the ends of which are embedded fragments of diamond in the shape of triangular prisms and held in place with…
Diamond Gravers
These are very similar to diamond drills and are mounted in the same manner, but usually consist of larger, though shorter and stronger…
Diamond Laps or Mills
These are of two kinds, one for grinding and the other for polishing. The grinding mills are copper discs, from an inch to an inch and a…
Diamond Files
Strips of copper into the face of which diamond powder of various degrees of coarseness has been hammered or rolled. Used for working…
Diamond Powder
A cutting and polishing agent prepared from the crushed chips from the diamond cutter's table, black, brown, and other inferior stones…
Dipleidoscope
An instrument invented by J. M. Bloxam, in 1843, used for determining the time of apparent noon. It consists of two mirrors and a plane…
Dimensions of American Chucks – Douzieme
NAME OF CHUCK. DIAMETER OF BODY IN INCHES. DIAMETER OF BODY IN MM. LENGTH OF CHUCK IN INCHES. ANGLE OF SHOULDER. PITCH OF
Draw Plate
A plate of very hard steel for drawing wire of various shapes and diameters. They are made for drawing round, half-round and square wire…
Drifting Tool
A tool for punching holes in mainsprings, etc. It consists of a frame to be held in the vise, through which a screw passes, and to the end…
Drills and Drilling
Drilling may be effected in two ways, by rotating the drill and holding the work stationary, or vice versa. The most satisfactory results…
Drill Rest
In using the lathe for drilling, a great saving in both time and drills can be effected by using a drill rest similar to that shown in Fig…
Drilling Lathe
A lathe, used for centering and drilling staffs and pinions, The plate has various sizes of conical holes for supporting the arbor, and can…
Drop
Is the amount of freedom allowed, in parts which come in contact with each other, to compensate for inaccuracies in workmanship. In…
Drum
The barrel of a turret clock on which the driving cord is wound. There is a variety of escapement, known as the Drum Escapement, which is…
Duplex Escapement
This escapement is shown in a plan view in Fig. 116, while Fig. 117 shows an elevation of the staff and one tooth of the escape wheel. This…
Dust Bands
Thin metal bands or guards which are inserted between the upper and lower plates of a movement to exclude all dust. EARNSHAW, THOMAS. A…
Doctoring
This term is applied to plating defective places which occurred either by accident or negligence on the part of the operator. It is equally…
Douzieme
A measuring tool having two limbs hinged together similar to a pair of scissors. One of the limbs terminates in a pointer that indicates…
Ductility
Tena city.(Number of lbs, sustained by c.787 of a line in diameter in wires of the various metals.) Fahrenheit Centig'de Platinum…
Draw, Drill Stock, Duplex Roller & Days
The angle of the locking faces of the pallets, as in the lever escapement. A tool used for nolding drills, the more modern variety having a…