









* 



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Anahjls of the Air. I 



frfat, then I made ufe cf large chymical recei- 

 vers inftcad of the glafs a y : But if theft 

 quantities were very fmall, then inftead of the 

 bolthcad and deep cylindrical glafs a y, \ 

 made ufe of a fmall cylindrical glafs, or a 

 common beer glafs inverted, and placed 

 under it a Viol or jelly glafs, taking care 

 that the water did not come at the ingrcdi. 

 cn'ts in them, which was cafily prevented 

 by drawing the water up under the inverted 

 glafs to' what height I pleafcd by means of 

 a fyphon ; I meafured the bulk of the fpaces 

 z-y or z n, by pouring in a known quan- 

 tity of water, as in the foregoing Experi- 

 ment, and making an allowance for the 

 bulk of the neck of the bolthcad, within 



the fpacc z )'. 



When I would take an eftimate of the 



quantity of Air abforbed and fiYd, or ge- 

 nerated by a burning candle, burning brim- 

 ftone or nitre, or by the breath of a living 

 animal, &c- I firft placed a high ftand, or 

 pcdcftal in the veffel full of water x X} 

 (Fig. 35.) which pcdefhl reached a little 

 higher than z z. On this pedeftal I placed 

 the candle, or living animal , and then 

 whelmed ovcritthelargeinvcrtcdglafs,££^> '• 



which 



ml 





- 



151 





1* 





•:: 



!l 



