17° Analyfis of the Air. 



broad mufflers, filled with 2,4, or more 

 'Diaphragms of flannel or cloth dipped in 

 a folution of Sal Tartar, or Tot-ajh, or Sea 

 Salt and then dryed. 



The like mufflers might alfo be of fervice 

 in many cafes where perfons may have urgent 

 occafion to go for a fhort time into an in- 

 fectious air : Which mufflers might, by an 

 eafy contrivance, be fo made as to draw 

 in breath thro* the Diaphragms, and to 

 breathe it out by another vent. 



In thefe and the like cafes this kind of 

 mufflers may be very ferviceable; but in 

 the cafe of the damps of mines they are by- 

 no means to be depended on, becaufe they 

 are not a fufficient fcreen from fo very 

 noxious vapours. 



Experiment CXVII. 



We have from the following Experiment 

 a good hint, to make thefe Salts of fervice 

 so us in fome other refpe&s, &c. 



I fet a lighted Candle under a large re- 

 ceiver (Fig. 35.) which contained about 

 4 gallons, it continued burning for 3 -j- i 

 minutes, in which time it had abibrbed about 



a 



