354 Description of an economical culinary Stove. 



gative electricity of Franklin, and the element of light, or pho- 

 togen, are only different names for the same thing. 



And the fire-air of Scheele, the dephlogisticated air of Priest- 

 ley, and tlie oxygen gas of Lavoisier, are only different names 

 for the same gas ; the elementary or imponderable part of which 

 is the same as the positive electricity of Franklin, and the ele- 

 ment of heat, or thermogen. 



That one of these is the element of light, and the other the 

 element of heat, may be demonstrated thus : The gas procured 

 from coals, with wliich the streets of large towns are now illu- 

 minated, contains the element of light. This element produces 

 a most brilliant light with very little heat, as it consumes only 

 a small quantity of the oxygen gas of the air. That the oxygen 

 gas of tlie atmosphere contains the element of heat, may be 

 clearly understood from the use of the blowpipe. This instru- 

 ment produces the most ir.tense heat, without increasing the 

 light of the lamp ; and the same effect is produced by other 

 blowing machines used to increase the heat of furnaces. 



Scheele observes in his Treatise on air and fire*, that " phlo- 

 giston is a true element and a simple principle, which enters 

 into so close and subtle an union with empyreal or fire-air that 

 it even penetrates through the most subtle pores of all bodies. 

 From this union arise both the matter of light, and likewise the 

 matter of heat f. In all these compositions phlogiston under- 

 goes not the least change ; and from the last composition it can 

 be separated again. Phlogiston can by no means be obtained 

 by itself; for it never separates from one body, though united 

 with it ever so closely, imless there be present another coming 

 in immediate contact with it." 



Hence tlie term phlogiston, which has been so much animad- 

 verted upon by chemical philosophers, is only another name for 

 that inflammable element contained in a certain class of bodies, 

 and this 's perhaps as proper a iiame as any other that has yet 

 been invented. 



Lynn, May 12, 1817. EzEKIliL WaLKEH. 



[To he continued.] 



LXXXIII. Description of an ceconomical culinary Stove. 

 By Rich. P. Player, Esq. Malmsbury . 



To Mr. Tilloch. 



Sir, — A coRRKsroNDENT in your Number for November last 

 has proposed some inquiries respecting the most ceconomical 



* Page 103, + The elements of lii;!it and heat are very difterclit 



frora the matter of lis;ht and the matter of heat. This very important sub- 

 ject still re.uains for investigatiou. 



constructiou 



