Chap. 6.] AScale efEeah 153 



jnents in the Memoirs of the Academy for 17 $4, p. 606, one pound 

 pf wax- taper confifts of 13 92. i gros, 23 grs. of charcoal, and 

 2 oz. 6 gros, 49 grs. of hydrogen. 



f By the foregoing experiments, the above 



quantity of charcoal ought to melt - - 79-39390 Ibs. of ice; 

 and the hydrogen mould melt - 52.37605 



In all 131.76995 Ibs. 



* Thus, we fee the quantity of caloric difengaged, from a burn- 

 ing taper, is pretty exactly conformable to what was obtained by 

 burning fe parately a quantity of charcoal and hydjrogen, equal to 

 what enters into its compofition. Thefe experiments with the ta- 

 per were feveral times repeated, fo that I have reafon to believe 

 them accurate.' Lav oifieS s Chemijlry. 



A SCALE OF HEAT. 



The firft part of this table is taken from Mr. Wedgwood's fcale, 

 according to his clay pyrometer, the reft is by Fahrenheit's 

 fcale. 



Fahr. 

 Extremity of the fcale of Mr. Wedgwood's ther 7 " 



mcmeter 32277 240 



Greateft heat of his final 1 air furnace 21877 J 6 



Caft iron melts 17977 *3 



Greateft heat of a common fmith's forge 1/327 125 



Welding heat of iron, greateft *34 2 7 95 



- - ..... , leaft 12777 90 



Fine gold melts - 5237 32 



Fine filver melts . 4717 28 



Swedifh copper melts 4587 27 



Brafs melts 3807 21 

 Heat by which his enamel colours are burnt 



on 1857 6 



Fahr. 



Iron with a white fparkling heat 2780 



Iron with a heat almoft white 2080 



The heat of live coals without blowing, perhaps about 1650 



Jron with a glowing red by day-light 1600 



