Mathematical and physical papers Volume 2; collected from differnet scientific periodicals from May, 1841, to the present time - Softcover

This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1884 Excerpt: ...in the other as the source of the heat taken in. Or an evolution of heat at any temperature and an absorption of heat at any lower temperature, may be taken advantage of for the same purpose, in a limited material system, neither taking heat from nor parting with heat to any external matter. Hence such a double thermal effect may be said to possess " dynamic moment." See the author's "Account of Carnot's Theory of the Motive Power of Heat," §§ 4 to 11, Train. Roy. Soc. Edinb., Jan. 2, 1849 Art. Xxj. Vol. above; also his "Dynamical Theory of Heat," §§ 8,13, 23 to 30, Trans. Roy.St ess ive Edinb., March 17, 1851, and " Dynamical Theory of Heat, Part VI. Thermo-electric Currents," § 102, Tram. Roy. Soc. Edinb., May 1, 1854 This latter series of articles under the general title " Dynamical Theory of Heat," has been republished in a succession of Numbers of the Philosophical Magazine, viz. §§ 1 to 80, Vol. Jnly to Dec. 1852; §§ 81 to 96, Vol. Jan. to June, 1855; §§ 97 to 181, Vol. Jan. to June, 1856 now constituting Art. Xlviii. Vol. i. above. 2. Of these various kinds of action, all except the first mentioned, depend essentially on certain definite properties of matter in regard to which different metals have remarkably different qualities. Thus in electro-magnetic engines the electric conductivity of the coils through which the current passes, and the magnetic inductive capacity and retentiveness of the iron cores of the electro-magnets, are essentially involved; and as essentially, when permanent magnets are used, the magnetic properties of steel, loadstone, or other bodies possessing strong retentiveness for magnetism. In the simple conversion of any kind...