D Daily Rate: The amount that a clock or watch gains or loses on correct time.Crocus: A iron oxide used in polishing brass or steel. A weight attached to the hour or minute arbor of a turret clock to counter balance the weight of a heavy hand. Counterpoise: A method of counter balancing. Chops: A term for pieces of wood or soft metal used to protect work held in a vise. Good quality clocks usually have 5 or more "crossings" in their wheels. Crossings: A clockmaker term for the spokes of a wheel. Civil Time: Two 12 hour periods starting at midnight. Cheeks: The part of a long case clock upon which the Seat board rests. Channelling An operation where grooves ae cut into woodwork to form a pattern. The outer case, usually made of leather, is the portfolio and the time-piece and its metal case is the Calotte. Watch Co.Ĭalotte: A type of watch case which fits into a folding case also know as a "Portfolio". This allowed for easier adjustment of the escapement. Butterfly: A cutout in the plate of a pocketwatch. It permits the view of the pendulum swing. Bulls Eye Door: A circular orifice in Tall Case clock doors. Bridge: A bracket with two feet commonly used to support the pivot of an arbor outside the plates of a clock. The center portion of a piece of bread, without the crust, about the size of a golf ball was kneaded up with oil to the consistency of putty and used by dabbing on to the work. Bread: Bread was used by the old English finishers as a means of cleaning the work during polishing.
In Horology it refers to the plates of a watch movement which have been bevelled to make the movement thin on the edge: a biseau movemnt. Belfrey: The hood of a tall case clock in which the movement is cased. Banking: when applied to the lever escapement, it is that part on which the lever rests or "banks". Backslope: the part of the balance staff which tapers from the balance on the underside: also refers to the cut at the back of a balance staff pivot. The term applies to both Anchor and Crown Wheel escapement clocks. Arkansas Stone: A fine grained, hard, whitish stone ( Silicone) used for whetting tools to a fine edge.īack Cock: The pallet cock of a pendulum clock. Albert: A watch chain, used as a means of attaching a pocket watch to a garment. Abacus: The uppermost member of the capital of a column. Ayr-Stone: A bluish-gray stone used with water to make a paste to add a finish to brass or other soft metals. Annealing: A process of heat treatment for reducing the degree of metal to give it maximum malleability or ductility. Action: A term used to denote the extent of the arc of vibration of the balance, or pendulum.