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timber, iron, or stone, placed in a wall under a girder or other beam, to distribute the weight or pressure.

part of any system in equilibrium or in motion; as, the tension of a srting supporting a weight equals that weight.

s, as gadolinite and samarskite, with other rare ytterbium earth. Symbol Tr or Tb. Atomic weight 150.

al, easily oxidized in moist air, but preserved by keeping under water. Symbol Tl. Atomic weight 203.7.

s reason. If all this be so, then man has a natural freedom. Locke. Now, then, be all thy weighty cares away. Dryden.

ic fever (Med.), the condition of fever produced by sunstroke. See Sunstroke. -- Thermic weight. (Mech.) Same as Heat weight, under Heat.

sed or operated by force due to the application of heat. Thermodynamic function. See Heat weight, under Heat.

ch burns in the air and forms thoria; -- formerly called also thorinum. Symbol Th. Atomic weight 232.0.

The breaking down of the roof of a gallery under its superincumbent weight. Thrust bearing (Screw Steamers), a bearing arranged to receive the thrust or endwise pressure of the screw shaft. -- Thrust plane (Geol.), the surface along which dislocation has taken place in the case of a reversed fault.

A bean-shaped coin of Siam, worth about sixty cents; also, a weight equal to 236 grains troy. Malcom.

le by being forged with a tilt hammer. Tilting helmet, a helmet of large size and unusual weight and strength, worn at tilts.

alloys. Its compounds are designated as stannous, or stannic. Symbol Sn (Stannum). Atomic weight 117.4.

hous powder, having a metallic luster. It burns when heated in the air. Symbol Ti. Atomic weight 48.1.

An old weight used in weighing wool, being usually twenty-eight pounds.

A weight of British India. The standard tola is equal to 180 grains.

A measure of weight or quantity. Specifically: --

total of which consists of the sum of the products obtained by multiplying the aggregate weight of each shipment in tons during the given period by the number of miles for which it is carried.

The weight of goods carried in a boat or a ship.

o top hamper.] All the ships of the fleet . . . were so encumbered with tophamper, so overweighted in proportion to their draught of water, that they could bear but little canvas, even with smooth seas and light and favorable winds. Motley.

ary engine used in the Middle Ages for throwing stones, etc. It acted by means of a great weight fastened to the short arm of a lever, which, being let fall, raised the end of the long arm with great velocity, hurling stones with much force.