IS* 



Exptriments ta afciriain 



Weights 

 as before 



grains. 

 No, 12 = 2048 

 No. 



9 = 



256 



200 



30 

 10 



The buoyancy of! j- 



the air bubbles > = -f ^ 

 being removed 3 '■ 



4 

 1,10 



3 



1,07 



Add the corrc£tion 1 2553,17 



for the lofs of ( _ 

 weight in the f ~ 

 wires, as before J 



And the more exaft") 



weight of the cylin- >• =2553,22 

 der in water becomes 3 



t 



Note, when 



the cube 

 the cylinder 



■ was weighed 



inches. 



■ with the temperature 6o'',5 

 inches. 



and the barometer 29,47 

 inches. 

 in water, its" 

 centre was below the] 

 _ furface of the water 



that is, the cylinder was the dcepcft by - - - = 1,2 



The repetition of this experiment fljews how ncceflary it is to attend to the moft trifling 



circumftances : there were not more than three or four of thefe particles of air, and thofe not 



larger than a fmall pin's head. Moreover, it may be noted, the diftilled water in which thefc 



experiments were made, being afterwards examined with my (Martin's) hydrometer, in the 



heat of 6o"'|, weighed on that fcale = i»ooo5 ; fo that I fee no reafon for diffidence in the 



quality of the water. 



(§. 24.) ji Synopfts «f the preceding Experiments. 



■* The weight of a cubic inch of common or rain water has been reckoned about 253 e;rains, fometimeS 

 = ^53>J3 grains, at others 253,18. But authors do not feem to have agreed in what they meant by common 

 water, rain water, /aw/' water, Jpring water, and diflilled wi\tr ; for occafionally they are all confounded, and 

 made to pafs for each other ; and fufficient notice fecms not to have been taken of the temperature to which 

 thefc weights were aifigncd. See Martin's Pbihfopbia Brilamica. Lewis's Philofophical Commerce of Arts. 

 Ckambcri's Dictionary, bv Dr. Rccs, &c. &c. 



The 



