REV 



PPT) AvTiMON'Y-OuE. See Minerai.ogy, jiddenda. 



IIESTONE Add_the tovv„n,ip f.U.ated >n Fayette 

 county contains 1224 inhabitants. 



REEL. See Manifacture e/^ Co«»«. 



REFRACTION, col. 14, '• 40, f">- %", '"• ^f • . 



RFFRIGF RATION. The following laws have been 

 dednclxl bv MM. Dulong ..nd Petit from the.r expenments 

 on the cooling of bodies. Sec Hkat. 



, If the cLhng of a body in a vacuum f^-rounded by a 

 medium whofe temperature is conllant could be obferved 

 du "^locity of cooling would decreafe ,n a geometrical 

 progredlon, while its temperature would decreafe m an 



arithmetical progreflion. ,■ r A- 



When the temperature of the medmm furrounding a 

 vacu'um remains conftant, the velocity of coolmg for excefs 

 of temperature in arithmetical progreiTion decreafes as the 

 terms of a geometrical progreffion diminifhed by a conftant 

 number. The ratio of this geometrical progreffion is the 

 fame for all bodies, and is equal to 1. 0077. 



5. The velocity of cooling of a body in a vacuum for a 

 conftant excefs of temperature increafes in a geometrical 

 progreffion, the temperature of the furrounding medium 

 increafing in an arithmetical progreffion. The ratio of that 

 progreffion is ttill 1.0077 for all bodies. 



4. The velocity of cooling ariiing from the fimple con- 

 taft of a gas is entirely independent of the nature of the 

 furface of a body. , - , 



5. The velocity of cooling aniing from the limple con- 

 taft of a fluid varies in a geometrical progreffion, the excefs 

 of temperature varying at the fame time in a geometrical 

 progreffion. If the ratio of this fecond progreffion be 2, 

 that of the firft is 2.35, whatever may be the nature of the 

 gas or its elafticity. 



R H E 



This law may be alfo expreffed by faying that the quan- 

 tity of heat removed by a gas is in every cafe proportional 

 to the excefs of temperature of a body raifed to the power 

 of 1.233. 



6. The cooling power of an elaftic fluid diminifhes in a 

 geometrical progreffion, while the tcnfion diminifhes in a 

 geometrical progreffion. If the ratio of this fecond pro- 

 greffion be 2, the ratio of the firft is 1.366 for air, 1.301 

 for hydrogen, 1.431 for carbonic acid, and 1.415 for 

 defiant gas. 



This law may be alfo expreffed in the following manner. 

 The cooling power of a gas, ceteris paribus, is proportional 

 to a certain power of the preffure. The exponent of that 

 power is 0.45 for air, 0.315 for hydrogen, 0.517 for car- 

 bonic acid, and 0.501 for defiant gas. 



7. The cooling power of a gas varies with its temperature 

 in fuch a manner, that if this gas can be dilated and be made 

 to preferve the fame elaftic force, the coohng power will 

 be as much leffened by the rarefaftion of the gas as it is 

 increafed by the heating of it ; hence the cooling power 

 of a gas depends in a definite manner upon its tenfion. 



REMONTOIR, col. 3, I. 15 and 23, for I ,-. L. 

 Col. 9, 1. 14, for balance r. balance-wheel ; 1. 26 and 29, 

 for i r. /. 



Vol. XXX. 



RESPIRATION, col. 15, 1. 21 from bottom, after 

 inches r. per minute. 



REVENUE. The ftatement of the revenue of Great 

 Britain, for the laft four years, appears in the following 

 table. 



REVOLUTION, French. Attheclofe,add— Onthe4th 

 of June i8l4,the king(Louis XVIII. )came to thetwocham- 

 bers to make a declaration of the conftitutional charter ; and on 

 the occafion delivered a fpeech diftinguiftied by its dignity and 

 propriety. On the 1 ft of March 18 15, however, Buonaparte, 

 having efcaped from Elba, landed in France, and by rapid 

 and uninterrupted marches haftened to Paris, and refumed 

 his power, March 22, 1815, but his fate was finally deter- 

 mined by the battle of Waterloo ; and he made his fecond 

 abdication, in favour of his fon, on the 23d of June 1815 ; 

 and on the 8th of the following month, the foreign troops 

 entered the capital. Difappointed in his views of fettling 

 either in America or in England, he furrendered himfelt, 

 with a fuite of forty perfons, to captain Maitland of the 

 Bellcrophon, Jul y 15, 1 8 1 5 ; and at Torbay he was transferred 

 to the Northumberland, which conveyed him to the ifland 

 of St. Helena, decreed by the allied fovereigns to be the 

 place of his future abojde. Here he arrived Oft. 1 6, 1815. 



Upon his departure from Paris, Louis XVIII. was again 

 reftored and fixed by the allied powers on the throne of 

 France. 



With refpeft to the events that have occurred fince 

 this article was written, fuch as the famous battle of 

 Waterloo (fee Waterloo), the total defeat of Buo- 

 naparte, his depofition from the government, his re- 

 moval from the capital, his confinement in the ifland of 

 St. Helena, the re-eftabliftiment of Louis XVIII., the 

 withdrawment of the allied troops, and the meafurcs adopted 

 for the fecure and permanent fovereignty of France, under 

 the prefent dynafty ; they are fo recent, and our limits are 

 fo reftrifted, that we muft refer the reader to document* 

 eafy of accefs for a minute detail and more ample inform- 

 ation. 



REUSSITE. See MiNEBALoey, Mdenda. 



RHEA, in Geography, a county of Eaft. Tenneffee, con- 

 taining 2504 inhabitants. 



RHODE 



