> as lemmas

1523 J. Fitzherbert Bk. Surueyeng xl. f. l^v They be called grounde mylnes, bycause the ouersyde of the heed sylle lyeth euyn leuell with the ouersyde of the grounde, in the bottom of the water.

1651 in Suffolk Deeds (Suffolk County, Mass.) (1880) I. 191 [They] doe Couenant to & with the sajd Peeter Oliuer to make vp the head sill of the wharfe appertayninge to the sajd ground.

1679 J. Moxon Mech. Exercises I. viii. 148 The Window Frames are so framed, that the Tennants of the Head-sell, Ground-sell, and Transum, run through the outer Jaums about four Inches.

1779 G. Boswell Treat. on watering Meadows x. 82 The head sill is at least a foot thick, and let down a foot under the bed of the river.

1856 C. Holtzapffel Turning & Mech. Manip. II. xxvii. 703 The sawpit..has..transverse pieces at each end, called head sills, upon which the one end of the timber rests, whilst the other end is supported on a transome.

1894 Builder 18 Aug. 120/1 All dressings throughout, window headsills, mullions and transomes, door-ways,..&c, are being executed in red terra-cotta.

1912 E. H. Frothingham Second-growth Hardwoods in Connecticut ii. 16 Oak timbers are widely used in car construction for head sills, bumpers, and box-car frames, and the like.

1935 Water & Water Engin. 37 511/2 Some increase of the depth of the navigable channel could be secured, but it was not to be anticipated that the artificially created cross section bounded by the head sills would remain permanently clear.

1961 P. d'A. Jones & E. N. Simons Story of Saw 27/2 Two strong timbers ran the whole length (side-strakes), with cross-pieces at either end (head-sills).