*Timing.* A device which times the sparking mechanism. *Timing device.* The entire mechanism which provides for sparking at certain periods. *Torque.* A twist. *Torsional.* A movement around a shaft. *Transmission.* The mechanism which sends the power from the engine to the axles. *Tubular housing.* A covering, or shield for a shaft such as a tube, within which the shaft is mounted. *Turnbuckle.* A device which provides for tightening a rod, wire, or strut. *Undulating.* Wave-like; a regular motion of a sinuous character. *Unison.* Together; acting as one. *Universal.* Pertaining to all things. *Universal joint.* A joint connecting two shafts so arranged that the shafts may be placed at an angle with each other. *Utilized.* To take advantage of. To use. *Vacuum.* A space from which the air has been exhausted. *Vaporize.* Changing from a solid or liquid into a gas. *Venturi.* A form of tube which is contracted between the ends. *Vertical.* A direction at right angles to the surface of water. *Vibratory coil.* A coil in a high tension circuit that has a spring finger which, in vibrating to and fro, cuts the current in and out. *Viscosity.* A glutinous, sticky body; slowly flowing; opposed to mobility; usually applied to thick oils. The degree of cohesion of a liquid, usually in connection with oils. *Volatile.* That which is easily changed into a gas at ordinary temperatures. *Volts.* The measure of the tension of a current. *Vulcanizing.* The process of treating raw rubber with sulphur in the presence of heat. THE MOTOR BOYS SERIES _(Trade Mark, Reg. U. S. Pat. Of.)_ By CLARENCE YOUNG 12mo. Illustrated. Price per volume, 60 cents, postpaid. [Illustration: Book: THE MOTOR BOYS] The Motor Boys _or Chums Through Thick and Thin_ The Motor Boys Overland _or A Lone Trip for Fun and Fortune_ The Motor Boys in Mexico. _or The Secret of The Buried City_