810 Relation letween the Specific Gravities and 



II. To determine the Value per Gaihn of any Spiriiuoui 

 Liquor differing in Strength from Proof , when that of 

 any other Liquor, which is similar in all other respects, 

 except Strength, i^ known — the Per-Centage of each 

 being given. 



Practical Rule. — Multiply the value per gallon given hj 

 tlie per-cejitage of the liquor whose value is required ; divide 

 the product by the per-centage of the liquor whose value is 

 given, and the cfioti^mt is the answer, 



EXAMPLES. 



1 . What is the value of brandy of 1 1 5 (or 1 5 0,P.) when 

 that of 87 (or 13 U.P.) is lis. per gallon ? 



4fii- It is worth 132 d. (= us.) x 115 -f- 87 = 174i 

 pence, or 14s. 6 ^ d. 



2. What is the value of brandy of 87 (or 13 U.P.) when 

 that of 115 (or 15 0. P.) is 14s. 6 id. per gallon? 



^Ins. It is worth 174-5d. (= 14 s. 6 id.) x 87 h- 115 

 = 132 pence, or lis. per gallon. 



III. To determine the Quantify of Spirit of any given 

 Strength which is equivalent in Palue to a given Ouan-- 

 tity of any other Strength. "^ 



Practical Rule.— Multiply the quantity given ly the per^ 

 rentage of the liquor ; divide the product hy the per-cent- 

 age of' the liquor whose quantity is required, and the quotient 

 is the answer. 



EXA^rPLES. 



1. How much Hollands of 113 (or 13 O.P.) is equiva- 

 lent to 556 gallons of 94 (or 6 U.P.) ? 



Ans. b5G X 94 -r- 113 = 462 j gallons. 



2. How much Hollands of 94 (or 6 U.P.) is equivalent 

 to 462 i gallons of 113 (or 13 O.P.)? 



Ans. 4621 X 113 -f- 94 = 556 gallons. 



§ 27. It will, perhaps, be --xpectcd from the authors of 

 this essay that they should here enter into a considerable 

 detail respecting the various cotiatructions and uses of those 

 instruments v/hich they are known to have manufactured 

 so extensively lor several ye;-! s past for these purposes. This 

 it is by no means their intention to <\o in the present in- 

 stance; a few observations, however, on the subject in ge- 

 neral may not be unimportant. 



It has been a very common error amongst the makers of 

 these mstnaments to conceive that their stem should be very- 

 Blender in proportion to their bulb j a construction which 

 rendered a great number of weights necessary, and which 



was 



