» 1 



264 Analyfis of the Air. 



in it 5 upon pumping, the candle went out 

 in 15 feconds of a minute; but when I took 

 away the three folds of cloth, and drew the 

 fulphureous fleams thro' the open fyphon, 

 the light of the candle was inftantly extin- 

 guiihed ; whence we fee the 3 folds of cloth 

 •preferved the candle alight 15". And where 

 the deadly quality of vapours in mines is not 

 fo ftrong as theie fulphureous ones were, the 

 drawing the breath through many folds of 

 woollen cloth may be a means to prefervelife 

 a little longer, in proportion to the more or 

 ■lefs noxious quality of the damps. 



When, inftead of the three folds of cloth, I 

 immerfed the end of the fyphon three inches 

 deep in water in the veffel x y (Fig. 32.) tho' 

 upon pumping the fulphureous fumes did 

 afcend vifibly through the water, yet tte 

 candle continued burning half a minute, i. e 

 double the time that it did when fumes paffec 

 thro' folds of woollen cloth. 



E X P E R I M E N T CX VI. 



I bored a hole in the fide of a large woodei 

 foflet ab y (Fig. 3^ ) and glewed into it th 

 great end of another foffet i /', covering th 

 prince with a bladder valve r : Then I fit 

 ted a valve .b i 7 to the orifice of the iro 



fypho 





