truss

In England, units of mass used in measuring hay and straw. By 36 George III, c. 88 (1796) sec. 2, 3 and 6, in London and within 30 miles of London

one truss of straw = at least 36 pounds.
one truss of old hay (Sept. 1 through May 31) = at least 56 pounds.
one truss of new hay (June 1 through Aug. 31, "if of the summer’s growth of that year") = at least 60 pounds.

36 trusses = 1 London load.

These sizes certainly existed before the Act, and they are found in areas other than the vicinity of London, ? – 19^th centuries. But in Bristol, a truss was 7 pounds.¹

1. James Britten.
Old Country and Farming Words.
English Dialect Society, number 30.
London: Trübner and Co., 1880.

Page 177.

Worlidge, 1704.

Report of the Commissioners, etc. 1820.

Alfred J. Martin.
Up-to-date Tables of Imperial, Metric, Indian and Colonial Weights and Measures…
London: T. Fisher Unwin, 1904.
Page 72.