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1797 J. Curr Coal Viewer 63 The strength of the U plates must be the same as the spear plates.

1819 M. Edgeworth Let. 4 Mar. (1971) 177 Excellent lecture room well lighted with gas spouting from U tubes at the bottom of the gallery.

1850 Athenæum 31 Aug. 922/2 By Arrangements of Coloured Liquids in a U Tube.

1868 C. B. Norton & W. J. Valentine Rep. to Govt. U.S. on Munitions of War at Paris Universal Exhib. 1867 273 Iron rolled in the fashion of the ordinary U-rail for railroads.

1878 W. de W. Abney Treat. Photogr. 289 A mirror..is suspended on two axes, xx, working a U-piece, ss.

a1884 E. H. Knight Pract. Dict. Mech. Suppl. 911/1 U bolt, a clevis for the attachment of axles, rods, etc., in machinery and vehicles.

1884 W. J. McGee in Proc. 32nd Meeting Amer. Assoc. Advancem. Sci. 238 The effect of temporary occupancy of a typical water-cut cañon by glacier ice will be to..change the original V to a U cross profile.

1888 Scribner's Mag. Aug. 177/2 Immediately below the bend of the U-magnet are the commutator segments.

1909 Webster's New Internat. Dict. Eng. Lang. U section, or U-section.

1928 E. Blunden Undertones of War viii. 80 A support line was being made, and very nice and proper it looked..with its clean U-frames..and symmetrical wire anchorages.

1947 W. H. Auden Age of Anxiety (1948) iii. 62 Let down From U-valleys like yarn, Waterfalls..Quietly encourage me on.

1959 Times 30 Sept. 13/6 (advt.) We don't care what you call us so long as you do call us when you are in need of cold drawn precision tubes... Not to mention..‘U’ bends.

1969 E. H. Pinto Treen 26 Early folding umbrellas were heavy and clumsy... The most important patents were that of Henry Holland..and that of Samuel Fox & Co. of Stockbridge, Sheffield, for the lighter U-section steel rib in 1852.

1969 Jane's Freight Containers 1968–9 578/1 The Conjack is a U-frame container lifter and transporter.

1974 ‘A. Garve’ File on Lester xx. 93 His wife had once lost a ring down a wash basin waste pipe and it had stuck in a U-bend.

1974 H. MacInnes Climb to Lost World ix. 132 Don was carrying up more climbing gear, pitons and bongs—large U-sectioned pieces of alloy or steel..which, when hammered into cracks as climbing aids, emit a resounding ‘bong-bong’.

1975 J. G. Evans Environment Early Man Brit. Isles iii. 69 We cannot see..the U-valleys of Lakeland with their sheer rock walls..without feeling the drama and immediacy of the Pleistocene ice.

1977 Western Morning News 30 Aug. 2/3 Reg. Cann, F.S.V.A., will sell by Auction,..steel U-sections.