Charing current to Chief engineer.

Charging current. (Elec.) Direct current applied to a storage 00tre1y to produce chemical action to charge the battery. Its directi.on is always the reverse of the discharge current.
Charging rate. (Elec.) The rate of flow, in amperes, of electric cur­rent flowing through a storage bat­tery while it is being charged.
Charles law. (Phys.) When the vol­ume is kept constant the pressure coefficient of all gases is the same:1/273 = 0.00366 per degree C.
Charring. (Shopwk.) Burning or scorching the surface.
Chase. (Mech.) (1) A lengthwise groove for the reception of a part to make a joint. (2) To cut threads. (Plast) An enclosure of any shape used to : (a) shrink-fit parts of a mold cavity in place; (b) prevent spreading or distortion in hobbing; (c) enclose an assembly of two or more parts of a split cavity block in which the contour of the casting is undercut (with reference to the lihe of closing of the mold); :;ome­times called a "yoke". (Print.) An iron frame into which pages or col­umns of type are locked up for the press.
Chasing. (Furn.) The ornamenting ofmetal by indenting, etc.
Chasing threads. (Mach.) Cutting threads with a chaser, which usually is a flat tool containing several teetn of the desired pitch.
Chassis. (Auto. Mech.) The unit which includes all parts of the car exce.pt the body.
Chatter. (Metalwk.) Caused in ma­chine work by lack of rigidity in the cutting tools or in machine parts.
Check. (Furn.) An inlay design com­posed of squares.
Checker. A checker should be a keen person always on the alert. It is his duty to check drawings for error and to see that specifications have been adhered to. A slip on the part of the checker may prove very expensive to his employer.
Checking of wood. (Shopwk.) Cracks in timber caused by uneven season­ing.
Check nut. (Mech.) Commonly called a lock nut. A nut screwed down .upon another nut causing a binding on the threads.
Check valve. (Plumb.) A valve which automatically closes to prevent the back flow of water.
Cheek. (Fdry.) The middle section of a three-part flask.
Cheltenham. (Print.) The name of a type ~vailable in a great variety of faces.
Chemical. (Chern.) A substance ob­tained by a chemical process.

Chemical action. That kind of action, change, or process in which the substance or substances present is or are changed into new or other substances.
Chemical change. (Chenl.) A change by which the identity of a substance is changed; e.g., burning a piece of ., coal.
Chemical dipbrazing. A dipbrazing process wherein the filler metal is added to the joint before immer­sion in a bath of molten chemicals.
Chemical engineer. A chemist whose activities include design and erection of chemical plants as well as research and general work in in­dustrial chemistry.
Chemically pure. (Chem.) Absolutely pure or free of any other.
chemical. In practice this is almost impossible to attain. The term generally means free from all but the very smallest amounts of chemical impurities.
Chemical pulp. (Papermkg,) Term applied to wood pulp made by the soda process from the wood of broadleaf trees.
Chemistry. The science or study of the composition of matter and those changes in matter in which new substances ~re formed.
chemurgy. The chemical salvage and ' conversion of waste. materials into new, useful products.
chenille. (Furn.) A soft fluffy thread or cord used in making a material of that name and fringes for furni­ture.
Chequer. (Furn.) A form of decora- , tion made up of squares; mu.ch used in inlay.
Cherry. (Metalwk.) A form of milling cutter which is more strictly a formed reamer, for finishing out the interior of a die or some similar tool. (Wood) A hard, close-grained, red or brown­coloured wood.
Chestnut. (Wood) A medium hard, coarse-grained wood, used for building trim and for inexpensive furniture.
Chestnut oak. (Wood) Tree medium size; wood dark brown with lighter sapwood; heavy, strong, and close grained. In many cases serves ,the same purposes as white oak. The bark is much used in tanning.
Chevron. (Arch.) (1) Ornamentation by a zigzag pattern, as used in Rom­manesque architecture. (2) Rafters in a gable roof that meet at the ridge.
Chewed. (Print.) An expression for the ragged effect of the lines of a plate caused by acid working through ail imperfect protection.
Chief chemical engineer. An impor­tant executive who should be a spe­cialist, both in management and in his specialized line of chemistry.
Chief draftsman. The connecting link between drafting room and manage­ment. He is responsible for efficient operation of the drafting room. All employees in his department are usu­ally under his direct supervision.
Chief engineer. In industrial plants the chief engineer is frequently styled "superintendent" or "works man­ager." He is responsible to the man­agement for the proper carrying out of the plant policies and should

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