a Standard of IVdght and Meafure, 155 



grains. jrains. 



From thence deduft the weight of the fcale in water =: 43S'09 



The net weight of the fcale in water becomes 



To which, add the corredion for the wires of the fcale 



being immerfed 2,53 inches deeper now, than when its 



weight in water was determined (fee table, §. 23.) 



And the corrected net weight, in water, is - - - 49>8i 



Which, deduced from its weight in air, leaves the weight of a bulk of) _ 28672 61 



water = the fphere, in temperature 66<',i - - j 



Correftion for o", i of heat * - - - - + >45 



And the true correfted weight of a bulk of water equal to the fphere,') __ 2867^06 

 reduced to the barometer = 29,74, and thermometer bd**,©, becomes 3 ~ 



grams. 



Exptriment the ^d. June 16, 1797. 



The true net weight of the fphere in air, reduced to a ftate of the baromc-7 _ 28722 ±2 

 ter of 29,74 inches, and thermometer 67*^, as in laft experiment - 3 ~ / '+ 



grains. 



Weight of the fphere, together with its fcale, in water,! 



6,8 inches below the furface ; the thermometer at {- = 484,20 

 66^1 - - . . ^ 



Deduft the weight of the fcale in water - - 435>09 



The difference is the net weight of the fphere in water, of 7 _ 



the temperature 66 "',4 - - 5 ~ 



To which, add the correction for the wires of the fcale 1 



being immerfed 5,5 inches deeper now, than when its ?• + ,44 



weight in water was determined (fee table, §. 23.) j 



The corre£led net weight, in water, becomes - - - = 49,55 



Which, dedudted from its net weight in air, leaves the Weight of a bulk! 

 of water = the fphere, and 6 inches below the furface, with the heat off =: 28672,87 

 66^4 - - - - - S 



Corrcdion for o,''4 of heat (fee table, §. 23.) - - = + 1,81 



The true corre£led weight of a bulk of water = the fphere, in the heat' 



of 66°,o, and with a preflure of the barometer of 29,74 inches, and 6^ zz 28674,68 

 inches below the furface _ - . . 



1= 



• One degree difference of heat in the water will alter the weight of the fphere in water, or the weight 

 of the bulk of water equal to it, = 4,54 grains ; fo that, by far the greateft fource of error, in thefe esxpe- 

 rimcnts, lies in the difficulty of exaftly knowing, and preferving, the temperaturt of the water. 



Rffults 



