Take diameter at bung, then square it, double it, then add square of
head diameter; multiply this sum by length of cask, and that product
by .2618 which will give volume in cubic inches; this, divided by 231,
will give result in gallons.
Take diameter at bung, then square it, double it, then add square of
head diameter; multiply this sum by length of cask, and that product
by .2618 which will give volume in cubic inches; this, divided by 231,
will give result in gallons.