Dear Jim, When the definition of the inch changed to 25.4�mm (in 1959) did this also mean that the definition of the U.S. gallon changed to suit the 'new' inch?
Cheers, Pat Naughtin LCAMS Geelong, Australia on 2003-03-07 08.02, James Frysinger at [EMAIL PROTECTED] wrote: > The U.S. gallon is defined in terms of volume, namely it is exactly 231 > cubic inches. Multiplying that by (2.54 cm)^3 shows that it is thus > 3785.411 784 cm3 (exactly). The first definition in the U.S., in 1832, > was based on the Queen Anne wine gallon in use in Great Britain until > 1824, one which had also been used in the colonies. The current > definition is codified in the Mendenhall Order of 1893. You may wish to > see my page at > http://www.cofc.edu/~frysingj/background.htm > for the dates 1832 and 1893. > > Note that the gallon is used for liquid measurement and one-fourth of > that is the liquid quart. The dry quart is defined as being one eigth of > a half peck or one sixteenth of a peck, there being two pecks to a > bushel. The bushel was originally intended to be the same as the > Winchester bushel used in Great Britain until 1824, but ours missed it > by a bit. The bushel here was defined by averaging the results obtained > in a survey of measures in use in various customs houses in the > colonies. See the above citation for more. > > Jim > > Terry Simpson wrote: >> >>> AFAIK, the US gallon is precisely defined as 5/6 imperial gallon, and >>> the imperial gallon is exactly 10 pounds of water (presumably at 4C). >> >> I don't know if the US has a definition of an imperial gallon. >> The following two countries have official definitions at: >> >> Ireland - Metrology Act 1996: >> http://193.120.124.98/gen531996a.html >> >> UK - Units of Measurement Regulations 1995: >> www.hmso.gov.uk/si/si1995/Uksi_19951804_en_2.htm > > -- > James R. Frysinger > Lifetime Certified Advanced Metrication Specialist > Senior Member, IEEE > > http://www.cofc.edu/~frysingj > [EMAIL PROTECTED] > [EMAIL PROTECTED] > > Office: > Physics Lab Manager, Lecturer > Dept. of Physics and Astronomy > University/College of Charleston > 66 George Street > Charleston, SC 29424 > 843.953.7644 (phone) > 843.953.4824 (FAX) > > Home: > 10 Captiva Row > Charleston, SC 29407 > 843.225.0805 >
