And--

(meas. of pf. spt. × 57·06) / 100 = equiv. meas. of abs. alc.

From which we derive the 'constant multipliers' 1·7525 (or roughly 1-3/4),

and ·5706, applicable to any number of volumes or gallons. For--

meas. of alc. × 1·7525 = equiv. meas. of pf. spt.

and--

meas. of pt. spt. × ·5706 = equiv. meas. of alc.

To ascertain what quantity of a spirit at any given strength is equiv. to

or contains 100 lbs. of absolute alcohol, we have only to divide the

constant number 2207·7 by the proof value per cent. of such spirit.[15]

Thus--for a spirit 12 u. p.--this would be

[Footnote 15: This number is obtained thus:--