2
“To the English Gentrie, and all others studious of the Mathematicks, which shall bee Readers hereof. The just Apologie of Wil: Ovghtred, against the slaunderous insimulations of Richard Delamain, in a Pamphlet called Grammelogia, or the Mathematicall Ring, or Mirifica logarithmorum projectio circularis” [1633?], p. 8. Hereafter we shall refer to this pamphlet as the Apologeticall Epistle<1
Aubrey’s Brief Lives, ed. A. Clark, Vol. II, Oxford, 1898, p. 106.
2
“To the English Gentrie, and all others studious of the Mathematicks, which shall bee Readers hereof. The just Apologie of Wil: Ovghtred, against the slaunderous insimulations of Richard Delamain, in a Pamphlet called Grammelogia, or the Mathematicall Ring, or Mirifica logarithmorum projectio circularis” [1633?], p. 8. Hereafter we shall refer to this pamphlet as the Apologeticall Epistle, this name appearing on the page-headings.
3
Companion to the [British] Almanac of 1837, p. 28, in an article by Augustus De Morgan on “Notices of English Mathematical and Astronomical Writers between the Norman Conquest and the Year 1600.”
4
New and General Biographical Dictionary (John Nichols), London, 1784, art. “Oughtred.”
5
Rev. Owen Manning, History of Antiquities in Surrey, Vol. II, p. 132.
6
Skeleton Collegii Regalis Cantab.: Or A Catalogue of All the Provosts, Fellows and Scholars, of the King’s College.. since the Foundation Thereof, Vol. II, “William Oughtred.”
7
Aubrey, op. cit., Vol. II, p. 107.
8
Rigaud, Correspondence of Scientific Men of the Seventeenth Century, Oxford, Vol. I, 1841, p. 5.
9
Aubrey, op. cit., Vol. II, p. 110.
11
Op. cit., Vol. II, p. 132.
12
Mr. William Lilly’s History of His Life and Times, From the Year 1602 to 1681, London, 1715, p. 58.
13
Rigaud, op. cit., Vol. I, p. 60.
14
Aubrey, op. cit., Vol. II, p. 107.
15
Rigaud, op. cit., Vol. I, p. 16.
16
Owen Manning, op. cit., p. 132.
17
New and General Biographical Dictionary (John Nichols), London, 1784, art. “Oughtred.”
18
Op. cit., Vol. II, p. 110.
19
Rev. Owen Manning, The History and Antiquities of Surrey, Vol. II, London, 1809, p. 132.
20
Op. cit., Vol. II, 1898, p. 111.
21
Budget of Paradoxes, London, 1872, p. 451; 2d ed., Chicago and London, 1915, Vol. II, p. 303.
22
The full title of the Clavis of 1631 is as follows: Arithmeticae in numeris et speciebvs institvtio: Qvae tvm logisticae, tvm analyticae, atqve adeo totivs mathematicae, qvasi clavis est. – Ad nobilissimvm spectatissimumque invenem Dn. Gvilelmvm Howard, Ordinis qui dicitur, Balnei Equitem, honoratissimi Dn. Thomae, Comitis Arvndeliae & Svrriae, Comitis Mareschalli Angliae, &c filium. – Londini, Apud Thomam Harpervm. M.DC.XXXI.
In all there appeared five Latin editions, the second in 1648 at London, the third in 1652 at Oxford, the fourth in 1667 at Oxford, the fifth in 1693 and 1698 at Oxford. There were two independent English editions: the first in 1647 at London, translated in greater part by Robert Wood of Lincoln College, Oxford, as is stated in the preface to the 1652 Latin edition; the second in 1694 and 1702 is a new translation, the preface being written and the book recommended by the astronomer Edmund Halley. The 1694 and 1702 impressions labored under the defect of many sense-disturbing errors due to careless reading of the proofs. All the editions of the Clavis, after the first edition, had one or more of the following tracts added on:
Eq.=De Aequationum affectarvm resolvtione in numeris.
Eu.=Elementi decimi Euclidis declaratio.
So.=De Solidis regularibus, tractatus.
An.=De Anatocismo, sive usura composita.
Fa.=Regula falsae positionis.
Ar.=Theorematum in libris Archimedis de Sphaera & cylindro declaratio.
Ho.=Horologia scioterica in plano, geometricè delineandi modus.
The abbreviated titles given here are, of course, our own. The lists of tracts added to the Clavis mathematicae of 1631 in its later editions, given in the order in which the tracts appear in each edition, are as follows: Clavis of 1647, Eq., An., Fa., Ho.; Clavis of 1648, Eq., An., Fa., Eu., So.; Clavis of 1652, Eq., Eu., So., An., Fa., Ar., Ho.; Clavis of 1667, Eq., Eu., So., An., Fa., Ar., Ho.; Clavis of 1693 and 1698, Eq., Eu., So., An., Fa., Ar., Ho.; Clavis of 1694 and 1702, Eq.
The title-page of the Clavis was considerably modified after the first edition. Thus, the 1652 Latin edition has this title-page: Guilelmi Oughtred Aetonensis, quondam Collegii Regalis in Cantabrigia Socii, Clavis mathematicae denvo limata, sive potius fabricata. Cum aliis quibusdam ejusdem commentationibus, quae in sequenti pagina recensentur. Editio tertia auctior & emendatior. Oxoniae, Excudebat Leon. Lichfield, Veneunt apud Tho. Robinson. 1652.
23
Rigaud, op. cit., Vol. II, p. 476.
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