This section is from the book "Bepler's Handy Manual of Knowledge And Useful Infomation", by David Bepler. Also available from Amazon: Bepler's Handy Manual of Knowledge and Useful Information.
Register ton. For register tonnage or for measurement of the entire internal capacity of a vessel:
100 cubic feet equal 1 register ton This number is arbitrarily assumed to facilitate computation. Shipping ton. For the measurement of cargo :
40 cubic feet equal
1 U. S. shipping ton. 32.146 U. S. bushels. 31.16 Imperial bushels.
42 cubic feet equal
1 British shipping ton. 33.75 U. S. bushels. 32.749 Imperial bushels.
1 U.S. or Winchester bushel equals 2150.42 cubic inches 1 Imperial bushel equals 2218.192 cubic inches. 1 " " " 1.0315157 U. S. bushels.
1 English quarter equals
8 1/4 U. S. bushels (nearly). 8 Imperial bushels. 17,745.54 cubic inches. 10.2694 cubic feet.
350 cubic feet equal 1 keel