310 On the Stren^hs and Values of Spirituous Liquors. 



Use op the PR£CEt)ING TABLE. 



This Table is to be entered with the specific gravity next 

 below that of the spirit at 60'^, againsc which there will i)e 

 found, in the second column^ the per-centage if t'mt were 

 really the specitiG gravity, and in the third the per-centage tO' 

 be subtracted for every unit that its specific gravity exceeds 

 the number in the first column. The fourth column, in 

 like manlner, contains the concentration per cent, of the 

 liquor against whose specific gravity it stands ; and the 

 fifth, the correction to be applied to the concentration for 

 every unit which the specific gravity differs from the nearest 

 in the first column. 



Example. 



What quantity of water must we add to 4'? 7 gallon? of a 

 liquor whose specific gravity is 883 at 48*^, to reduce it to 

 proof; and how nmch proof spirit will it make: 



^Tis. We find by Table J that the specific gravity of the 

 liquoc at 60° would be 883 — -456 x 12 = BJ?-? very 

 nearly. 



We see also by Table II that if the specific gravity at 60"^ 

 was 873, the per-centage would be 133*07; but that, as it 

 is 9371, ^ve must subtract -670 x Q\, or r67, from the 

 per-centage standing against 875. The real per-eentage 

 of the liquor, therefore, at 60° is 133-07 — l'G7 = 131-4; 

 and 100 : 131-4 :: 427 : 561-08; which latter, therefore,, 

 will be the quantity of proof spirit produced. 



The only remaining question is as to the qiiantity of 

 water necessary to produce these 561 gallons of proof. For 

 this we must find the concentration by Table II. Now 

 the concent '■at ion of spirit of 875 at 60° is 1*86 per cent., 

 and that of' spirit of 877+ = 1-86 — -048 x 2^ = 1-74. 

 Therefore 31-4 + 1-74, or 33-14 gallons,, is the quantity 

 of water to be added to every I'OO gallons of the given spirit 

 to reduceit to- proof, making 14H gallons in the whole. 



§ 4(). The two preceding Tables, therefore, as will be seen- 

 by the foregoing example, are,, in fact, capable of answer- 

 n.g all the most necess?j:y questions to be resolved by those 

 of Mr. Gilpin, and the solution of which cannot, indeed, 

 be obtained from- them except by a process of some length. 

 The calculation of the numbers in these tables, short as 

 they arc, was a work which occasioned the authors some 

 trouble, but which was necessary for the graduation of 

 t'losc instruments with which they have, in a great mea- 

 sure, supplied Europe. They give the per-centage and con- 

 centration at 60" only, on the supposition that the given 



liquor 



