d 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 circumference of the earth.

Micrometer. A tool for measuring small spaces 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 mass 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 quantity.

Mutilated. As applied to a gear, one in which cert