the Strength and Values of Sblrltmus Liquors. 20? 



temperatures, and with every possible precaution, the quan- 

 tities of fluid by weight did not appear to differ more than 

 about T^^ij^jth of the whole. 



The ijottle being filled nearly to the mark^, the liquor was 

 then brought to the required temperature, as ascertained by 

 a thermometer made for the purpose by the late Mr. Rams- 

 den, and graduated to fifths of a degree of Fahrenheit's 

 scale, which was introduced through the neck into the li- 

 quor, its bulb being only -22 of an inch in diameter. The 

 neck was then filled quite up to the mark with more of the 

 .same liquor at the same degree of heat, and the whole 

 weighed in that state. This was performed at every five 

 degrees of temperature. The first temperature at which 

 the liquor was weighed was 6o" ; it was then gradually 

 cooled down to 55", 50, 45, &c., and, lastly, to 30°; after 

 which its temperature was in like manner raised to 100°, it 

 being again weighed at every five degrees ; and, lastlv, it was 

 again cooled down to 60°, at which temperature it was 

 weighed a third time, and the process terminated with re- 

 spect to that compound. 



The l)alance was that of the societv, made by the late 

 Mr. Ramsden, and of which some account may be found 

 111 the 33d volume of the Journal de Physique. It was so 

 exceedingly sensible, that the fiftieth part of a crain consi- 

 derably deranged tlie position of the beam whenloaded with 

 the scales and their contents in these operations. 



From this course of experiments Mr. Gilpin afterwards 

 computed a voluminous set of tables, which are published 

 in the Philosophical Transactions for the year 179-1. They 

 occupy 100 quarto pages closely printed; each paee bcina^ 

 divided in the middle, so as to be virtually cxtendedlo twice 

 its length. 



They are calculated for every degree of temperature, from 

 30° to 80° of Fahrenheit's thermometer, the results at each 

 of which occupy two of these pages, the degree of heat 

 standing at the head of each. 



The left hand jiage contains those belonsing to all com- 

 pounds of 100 parts by weight of alcohof of the specific 

 gravity of 825 at O'0°, with every integral proportion of water 

 also by weiglitfroin to 100; and the right hand pn.jc tho.se 

 belonging to all compounds of 100 paiTs bv weight of wa- 

 ter, with every proportion of such alcohol also by weight 

 hoin to 100. These mixtures by weight constitute Co- 

 lumn I m each table, which is entitled accordingly, on the 

 Ick hand page, " Spirit and Water by Weight, '' and on 

 the right hand page, '* Water and Spirit by Weight." 



Column 



