ids UJfsf Sleam as a Vehicle for conveying Heat. 



formerly ufed. It appears from the analyfis of Deiman and Davy, that the oxide under 

 obfervation confifts of above 0,37 of oxigen, and 0,63 of azote or nitrogen. Secondly, 

 Thit nitrous gas, or nitrous oxide confifts of about 0,68 of oxigen, and 0,32 of azote. 

 Accordingly Deiman diftinguilhes thefe two oxides by the names, oxide of azote, or of ni- 

 trogen, and nitrous oxide, which terms are little elfe but an inverfion mutually of their order, 

 and befides have no fpecific import. Is it worth while to propofe the appellations,y«i-oxzV« 

 of nitrogen, or azote, and oxide of nitrogen, or azote, In place of the names in ufe? This 

 method is analogous to the mode of the new nomenclature in its lateft improvements, as 

 in the inftances fub-muriate, and muriate of mercury, fub-carbonate, and carbonate of 

 alkali, fub-phofphate, and phofphate of lime, &c. 



I am, 



YOUR FRIEND. 



HI. 



0« the Ufe of Steam as a Vehicle for conveying Heat from one Place to another. 



By Count Rumford. 



(Continued from page 160.) 



Xn order that clear and difl:in£t ideas may be formed of the various parts of this appara« 

 tus, — even without figures, — ^I ftiall diftinguifii each part by' a fpecific name : the veiTel in 

 which water is boiled in order to generate fteam — and which, in its conftru£lion, may be 

 made to refemble the boiler of a fteam engine — I fliall call the f earn ioiler :—Tbc vertical 

 tube, which, rifing up from the top of the boiler, conveys the fteam into the tubes (nearly 

 horizontal), which are fufpended from the cieling of the room, I fhall call the pritne con- 

 duffor •• to the horizontal tubes I fhall give the name of horizontal condiiBors, or fimply, 

 conductors of fleam : and to the (fmaller) tubes, which, defcending perpendicularly from 

 thefe horizontal conduBors, convey the fteam to the liquids which are to be heated, I ftiall, 

 cxclufively, appropriate the appellation oi fleam tubes. 



The veflels in which the liquids are put that are to be heated I fliall call the containing 

 wffels. — ^Thefe veflels may be made of any form; and, in many cafes, they may, without 

 any inconvenience, be conftru£ted of wood, or of other cheap materials, inftead of being 

 made of coftly metals, by which means a very heavy expence may be avoided. 



"Lzch fleam tube muft defcend perpendicularly from the horizontal conduElor with which 

 it is conne£led, to the level of the bottom of the containing veffel to which it belongs ; and, 

 moreover, muft be furniflied with a good brafs cock, perfedtly fteam- tight; which may 

 beil be placed at the height of about fix feet above the level of the floor of the room. 



This 



