TerFtacle

[L.] A kind of arm or fleshy proce attached to the head or body of some insects and other animals, by which they feel, grasp, or move. A kind of pottery or baked red clay. (See Brick.) that burrows into holes in the earth after rabbits, rats, etc. The Skye has long hair and drooping ears. English and black and tan have short, close, smooth hair and upright ears. Fox ter¬ riers are both smooth and rough in variety. rushes for roofs of buildings or stacks of hay or grain. Palm leaves are used in the West Indies for thatching. measure.] An instrument for measuring changes of temperature by the contraction or expansion of a liquid or a gas. The three scales at present in use are—(1) the Fahrenheit, in common use in Great Britain and the United States; (2) the Centigrade, used on the Continent and in scien¬ tific works generally (3) Reaumur’s scale, used in Ru ia. In Fahrenheit’s scale the freez¬ ing-point is marked 32°F. and the boiling-point 2i2°F. the intervening space containing 180°. In the Centigrade scale the space between the two points is divided into 100 equal parts— the freezing-point being marked o° C., and the boiling point ioo° C. In Reaumur’s scale the freezing-point is marked o° R., and the boiling point 8o° R., the space between the freezing and the boiling-points being divided into 80 equal parts. Since 180° on the Fahrenheit scale cor¬ respond to ioo° on the Centigrade, the length of one degree Fahrenheit is ioo-i8oth or 5 9th of one degree Centigrade, and any reading on the Fahrenheit scale is converted into the cor¬ responding Centigrade reading by the following rule: Subtract 32 and multiply the remainder by 5~9th. When very low temperatures are required an alcohol thermometer is used, because mercury freezes at about -38° F. Air is of great use in determining temperatures above those at which mercury can be employed (mercury boils at 66o° F.). Other types of thermometers are 'maxi¬ mum, minimum, and solar radiation or self registering thermometers. (See Fahrenheit, Reaumur.)