A nail, as a unit of cloth measurement, is generally a sixteenth of a yard or 2 1⁄4 inches (5.715 cm). The nail was apparently named after the practice of hammering brass nails into the counter at shops where cloth was sold. On the other hand, R D Connor, in The weights and measures of England (p 84) states that the nail was the 16th part of a Roman foot, i.e., digitus or finger, although he provides no reference to support this. Zupko's A dictionary of weights and measures for the British Isles (p 256) states that the nail was originally the distance from the thumbnail to the joint at the base of the thumb, or alternately, from the end of the middle finger to the second joint.
The nail in literature
Oh, monstrous arrogance! Thou liest, thou thread,
Thou yard, three-quarters, half-yard, quarter, nailthread!
Thou flea, thou nit, thou winter cricket thou:―
Brav'd in mine own house with a skein of
Explanation: Katherine and Petruchio are getting married. At the tailor shop, they examine the wedding dress, which is nearly finished. Petruchio is concerned that it has too many frills, wonders what it will cost, and suspects that he has been cheated. Katherine says she likes it, and complains that Petruchio is making a fool of her. The taylor repeats Katherine's words: Sir, she says you're making a fool of her. This is where Petruchio launches into the above-quoted tirade. Monstrous may be a double-entendre for cuckold. The half-yard, quarter and nail were divisions of the yard used in cloth measurement.
The nail in law
VI. For reformation whereof, be it enacted That from and after the first day of April next coming every of the said cottons being sufficiently milled or thicked, clean scoured, well wrought and fully dried, shall weigh twenty-one pounds at the least and shall contain in length twenty-one goads, or twenty-goads at the least, and in breadth at the most three quarters of the yard, or within one nail of three quarters of the yard at the least: (2) And that every of the said frizes or rugs being thicked and fully dried shall weigh forty-four pounds at the least and shall contain in length betwixt thirty five-yards and thirty-seven yards, and shall contain in breadth at the most three quarters of the yard, or within one nail of three quarters at the least, and not to be strained upon the tentors above one nail in breadth.— 8 Elizabeth 12 (1565) An act for the aulnegers fees in Lancaster, and for length, breadth and weight of cottons, frizes and rugs.
I. ...shall be made full Yard and Nail, or full Three Quarters of a Yard and Nail, that when whitened it may be full Yard or full Three Quarters of a Yard in Breadth...
II. ...for every Half a Quarter the Three Quarters Yard and Nail plain Cloth shall exceed the said Breadths, shall forfeit the Sum of for Five Shillings Sterling...— 10 Anne 21 (1711) An Act to prevent Abuses in making Linen Cloth, and regulating the Lengths, Breadths and equal sorting of Yarn, for each Piece made in Scotland, and for whitening the same.
- Charles Arnold (1850). The boy's arithmetic. p. 54. Retrieved 23 January 2012.
- William White (1874). Notes and queries. Oxford University Press. p. 274. Retrieved 23 January 2012.
- Bill Gove (2006). Logging railroads of the Adirondacks. Syracuse University Press. p. 31. ISBN 978-0-8156-0794-6. Retrieved 23 January 2012.
- McClure's magazine. S.S. McClure. 1897. p. 748. Retrieved 23 January 2012.
- R. D. Connor (1987). The weights and measures of England. H.M.S.O. p. 84. ISBN 978-0-11-290435-9. Retrieved 25 January 2012.
- Ronald Edward Zupko (1985). A dictionary of weights and measures for the British Isles: the Middle Ages to the twentieth century. American Philosophical Society. pp. 256–7. ISBN 978-0-87169-168-2. Retrieved 23 January 2012.
- William Shakespeare (1778). The plays of William Shakespeare in ten volumes: with corrections and illustrations of various commentators. Printed for C. Bathurst. p. 272. Retrieved 25 January 2012.
- Michael W. Shurgot; Margaret E. Owens (1998). Stages of play: Shakespeare's theatrical energies in Elizabethan performance. University of Delaware Press. p. 43. ISBN 978-0-87413-614-2. Retrieved 14 February 2012.
- Great Britain; Danby Pickering (1763). The statutes at large: from the Magna Charta, to the end of the eleventh Parliament of Great Britain, anno 1761 [continued to 1807]. Printed by J. Bentham. p. 250. Retrieved 25 January 2012.
- Great Britain; Sir Thomas Edlyne Tomlins; John Raithby (1811). The statutes at large, of England and of Great Britain: from Magna Carta to the union of the kingdoms of Great Britain and Ireland. Printed by G. Eyre and A. Strahan. pp. 359–60. Retrieved 25 January 2012.