Practical Mechanics for Boys Part 25

Inconsequential. Not of much importance.

Isometric. That view of a figure which will give the relation of all the parts in their proper proportions.

Jaw. The grasping part of a vise, or other tool.

Joule. The practical unit of electrical energy.

Key-way. A groove in a shaft and in the hub of a wheel, to receive therein a locking key.

Kilowatt. A unit of electrical power; one thousand watts.

Kinetic. Consisting of motion.

Lacing. The attaching of the ends of a belt to each other.

Lap. A tool, usually of copper or lead, on which flour emery is spread, with oil, and used to grind out the interior of cylinders.

Lapping. The act of using a lap to grind out cylinders.

Lacquer. A varnish for either wood or metal.

Lazy-tongs. A form of tool, by means of which a long range of movement is attainable, and great grasp of power.

Levigated. Reduced to a fine powder.

Litharge. A form of lead used in paints for drying purposes.

Longitudinal. Lengthwise.

Luminous. That which has the capacity to light up.

Magnet. A bar of iron or steel that has electricity in it capable of attracting certain metals.

Manipulation. Capable of being handled.

Mandrel. The revolving part of a lathe; a rod or bar which turns and carries mechanical elements thereon.

Manually. Operated by hand.

Margin. An edge.

Malleability. Softness. The state of being formed by hammering.

Magnetism. A quality of certain metals to receive and hold a charge of electricity.

Major axis. The measurement across the longest part of an ellipse.

Minor axis. The distance across the narrowest part of an ellipse.

Meridian. The time when the sun crosses the middle of the heavens; midday.

Metric. Measure; a system which takes the unit of its measurement from the circ.u.mference of the earth.

Micrometer. A tool for measuring small s.p.a.ces or intervals.

Milling machine. A large tool for the purpose of cutting gears and grooves or surfaces.

Miter. A meeting surface between two right-angled pieces.

Momentum. That quality of matter which is the combined energy of ma.s.s and speed.

Molecular. Any substance that is made up of any particles; the component elements in any substance.

Modifications. Changes; improved arrangements.

Multiplicity. Many; numerous; a large quant.i.ty.

Mutilated. As applied to a gear, one in which certain teeth are removed.

Nautical. Marine; applied to s.h.i.+pping, and the like.

Neutralizes. Any substance, like a chemical, which, when added to another chemical, will change them both.

Nitro-glycerine. An explosive made from glycerine and nitrogen.

Oblique. At an angle; inclined.

Obliterate. To wipe out.

Obvious. That which can be seen; easily observed.

Obtuse. A blunt angle; not noticeable.

Odophone. An instrument for determining and testing odors.

Olfactory. The nerves of the sense of smell.

Orifice. An opening; a hole.

Oscillation. A movement to and fro, like a pendulum.

Oxygen. The most universal gas, colorless and tasteless; is called the acid-maker of the universe and unites with all known substances, producing an acid, an alkali, or a neutral compound.

Oxidizing. To impart to any substance the elements of oxygen.

Oxide. Any substance which has oxygen added to it.

Pallet. A part of a tooth or finger which acts on the teeth of a wheel.