538 HENRY SOTHERAN & CO., 140, STRAND, W.C, and 43, PICCADILLY, W. 



10S02 LEYBOURN (Thomas, B. M. Coll., Sandhurst) The Mathematical Questions, proposed 

 in the Ladies' Diary, and their Original Answers, with some New Solutions, from 1704 to 

 1816, diagrams, 4 vols. Svo. calf^ with bookplate of Henry Bickersteth {Lord Lanqdale, Master of 

 the Rolls), Us 6d ' 1817-18 



10303 LEYBOURN (William) Arithmetick : Vulgar, Decimal, Instrumental, Algebraical 

 .. . . whereunto is added, the Construction and Use of several Tables of Interest and Annuities, 

 "Weights and Measures, both of our own and other Countries, 4th Edition, corrected and enlarged, 

 with 2 folding copperplates, 8vo. old calf {binding slightly damaged), with numerous contemporary 

 MS. notes {rare), I2s 6d ' G. Sawbridge, 1678 



This edition was unknown to the author's biographer in D. N. B., where the 1st and 2nd editions only are mentioned. 

 The fourth part is a translation of Jacques de Billy's Algebra (o. No. 6220, ante). 



10804 The Art of Dialling, performed Geometrically, by Scale and Compasses : Arith- 

 metically, by the Canons of Sines and Tangents : Instrumentally, by a Trigonal Instrument, 

 accommodated with Lines for that purpose : the Geometrical Part whereof is performed by 

 Projecting of the Sphere in Piano, upon the Plain itself, whereby not onely the Making, but the 

 Reason also of Dials is discovered, first edition, with fine etched seated portrait, joliing plate, 

 and diagrams, sm. 4to. contemporary calf {binding slightly damaged and pp. 145-52 ynissing) : 

 very rare, £1. 15* B'. Tooke and T. Sawbridge, 1669 



This edition is excessively rare, that of 16S7 being given by Hutton as the first, and was unknown to the author's 

 biographer in D. N.B. It was also unknown to Lowndes, Watt, and Allibone. The portrait affixed is probably that by 

 Gay wood, Pbt. 30? 



1080 ) The Compleat Surveyor : containing the whole Art of Surveying of Land, by the Plain 



Table, Theodolite, Circumferentor, and Peractor : after a more easie, exact and compendious 

 Manner, then hath been hitherto published by any . . . with the taking of all Manner of Heights 

 and Distances . . . also, the Manner how to know whether Water may be conveyed from a Spring 

 head to any appointed Place or not, etc. etc., first edition, with etched portrait (ct. 27, and num- 

 erous diagrams, folio, contemporary English calf {name on title, and some II. slightly soiled) ; RARE, 

 with auto, of Francis Hargrave (1741-l'821) on flyleaf £1. 155 R. and W. Leybourn, 1653 



10803 Another Copy, contemporary calf {binding damaged, blank margin of portrait defective, 



and some II. water-stained), £1. IOj' 

 A VERY RARE EDITION, uukuown to Watt. It was originally published in 1650 as ' Planometria ' by ' Oliver Wallinbv '. 



10S07 ; — Third Edition, corrected and much enlarged, with flne portrait aet. 48 by R. White 



( fine impression), numerous folding plates, and diagrams, folio, contemporary calf [with British 

 Museum bookstamp, and back of title slightly damaged, otherwise a fine and tall copy) ; rare, £ 1 . 10s 



G. Sawbridge, 1674 



1080? Another Copy, with title and 'Address' {pp. 2) supplied from the 1653 Ed.; con- 

 temporary sheep {large and sound copy, with contemporary MS. 7iotes), with bookplate of the Rt. 

 Hon. Sir George Rose, £1. 5s 



10809 The Description of an Entertaining and Useful Instrument, called Gunter's 



Quadrant, by which is performed most Propositions in Astronomy ; as the Altitude, Azimuth, 

 Kiuht Ascension and Declination of the Sun, etc., also his Fdsing and Setting, with Hour of the 

 Day or Night, and other Conclusions exemplified at large ; with the Use of the Universal 

 IliNG-DiAL ; 4th Edition, with Improvements, folding front, on copper, 12mo. fine copy in 

 -contemporary sheep {Joints tender) ; rai^e, 15s J. Gilbert, 1771 



This edition was unknown to D. N. B.. which gives that of 1731 as the last. It contains at end a C-p. Catalogue of the 

 Mathematical and Optical Instruments ofits i)ublisher. 



10510 Dialing: Plain, Concave, Convex, Projective, Reflective, Refractive; shewing, how to 



make all such Dials, and to adorn them witli all useful Furniture relating to the Course of the 

 Sun, performed arithmetically, geometrically, instrumentally and mechanically, first edition, 

 with numerous copperplates, iolio, old calf {one joint cracked, portrait wanting, and one plate in 

 MS.); VEPY rare, £2. 15* Awn'sham Churchill, 1682 



An enlargement of the 'Art of Dialling', and the fullest treatise on the subject in English hitherto published. Pp. 

 323-30 contain a description of the celebrated Whitehall Dial, A.D. 1669, constructed by Francis Line {alias Hall), s.j., 

 with a copperplate illustration. 



10511 Second [last] Edition, corrected and Two New Tractates added, with fine portrait 



Oil. 64 by R. White, and numerous plates, folio, old calf gilt, rebacked (rare), £3. lOs 



J. Matthews, for Awnsham and John Churchill, 1700 



10812 Another Copy, contemporary calf {back damaged; and browned on margins), £3. 35 



10813 The Same {portrait wanting, a few II. slightly ivormed, and a small piece torn out of 



blank top of title, but a large and sound copy) ; original calf, £2. 8s 6d 



Both the above editions (no others were published),' are very rare, and were unknown to the author's biographer in 

 If N. B., Lowndes, Watt, and Allibone ; while Dr. Hutton only mentions that of 1700. They contain a description 

 of Father Line's (or Hall's) celebrated sun-dial set up in Charles Il.'s private garden at Whitehall in 1669, with a plate 

 illustrating it. Both editions contain chapters on ' reflex dialling ' by John Twvsdex and I. Halton, and on ' refractive 

 dialling.' 



10S14 — The Line of Proportion or Numbers, commonly called Gunter's Line, made easie : 



by which may be Measured all Manner of Superficies and' Solids . . . also, how to perform the 

 same by a Line of Equal Parts, drawn from the Centre of a Two Foot Rule, with the Use of the 

 Line of Proportion Improved, etc. etc , with plate, 1684 : The Second Part, with the Addition of 

 other Lines, which may conveniently be put upon a Two-Foot Rule, and their Usas Exemplified 

 . . . with Supplement, containing' the Description and some Uses, of a convenient Two-Foot 

 JoYNT-RuLE: upon which are inscribed divers Lines and Scales, sutable to all sort of Artificers 

 Occasions, by John Brown, 2 v. '77-6—3 vols. 24mo. in 1, contemporary calf [one joint cracked) ; 

 BARE, £1. IOj //. 'and'G. Sawbridge, 1684-76 



The author claims to have improved Gunter's slide rule, as modified by Wingate, Milbourn, and Seth Partridge, 'and 

 «o ordered the line, that it will perform the work without comijasses, by 'inspection, looking onely upon the ruler." 



