534 HENRY SOTHERAN & CO., 140, STRAND, W.C., AND 43, PICCADILLY, W. 



10724 LEONABDO Pisano [BONACCI rive FIBONACCI ; floruit A. D. 1200] SCRITTI (II LTBER 

 ABBACI, e La PRACTICA GEOMETRIC), publicatidaBALDAssARRE BONCOMPAGNI ; with numerous 

 diagrams, 2 vols. folio, sewn, uncut, 2. 2s Roma, 1857-62 



10725 II LIBER ABBACI, publicato secondo la Lezione del Codice Magliabechiano C. I, 2616, 



Badia Fioientina, no. 73, da BALDASSARRE BONCOMPAGNI ; with numerous diagrams, folio, sewn, 

 with inscr. to the Duca Massimo, 1. 1* ibidem, 1857 



' He explains in his Liber Ablaci the Arabic system of numeration, and remarks on its great ad vantages over the Roman ; 

 gives an account of algebra, and points out the convenience of geometry to get rigid demonstrations of algebraical 

 formula. He shews how to solve simple equations, solves a few quadratic equations, and states some methods for the 

 solution of indeterminate equations . . . The Liber Abbaci is especially interesting in the history of arithmetic, since 

 practically it introduced the use of Arabic numerals into Christian Europe.' W. W. R. Hall. 



10726 , TRE SCRITTI INEDITI di, pubblicati da BALDASSARRE BONCOMPAGNI ; with folding 



plate, 8vo. sewn, with editor's inscr. and MS. CORRECTIONS AND ADDITIONS, 7s Qd Firen'ze, 1854 



The questions propout.ded to Leonard of Pisa by the celebrated Emperor Frederick the Second on his p?ssage through 

 Pisa in 1225, which resulted in the production of three of Leonard's most remarkable works. The volume, here first 

 printed by M. Boucompagni, contains 'Super Solutionibus quarundem Questionum ad Numerum et ad Geometriam 

 vel ad utmmque pertinentium, Liber Quadratorum.' 



10727 LEOTAUD (Vincent, s.j.) CYCLOMATHIA, seu MULTIPLEX CIRCULI CONTEMPLATKX III 

 Libris comprehensa. I. Quadrature Exanien confirmatur ac promovetur. II. Anguli Con- 

 tingentue Natura exponitur. III. Quadracitis Facultates Inauditse profemntur ; with engraved 

 arms on title, and numerous diagrams, 4to. contemporary Italian vellum (somewhat browned as 

 usual and title stamped, otherwise a fine copy}, 18s Qd Lugduni, 1663 



A defence of the views of Clavius on contiguous angles. It was answered by Wallis. 



' Oet ecrit est suivi d'un traite sur la quadratice de Dinostrate, ou 1'auteur developpe quelques proprietes non encore 

 aperc.ues de cette courbe.' P>inyr. Gen. 



10728 [LEBEBOUBS (Noel Marie Paymal, opticien)] TRAITE de GALVANOPLASTIE, par J. L. ; 

 with 11 illustrations, roy. 8vo. sewn (scarce), 7s 6d 1843 



One of the earliest practical treatises on electrotyping, published only a few years after its invention by Jacobi (v. A~i>. 

 9700 an'e. 



At end is a 16 p. Catalogue of Photographic Apparatus, Microscopes, etc. made by the author. 



10729 TREATISE on PHOTOGRAPHY ; containing the latest Discoveries and Improvements 



appertaining to the DAGUERREOTYPE, translated by J. EGERTON, with folding plate , cr. 8vo. cl. 

 (scarce), 12s Qd 18*3 



Containing chapters on 'Photogenic Papers on the Calotype,' by H. Fox TALBOT, F.R.S., ' On a Voltaic Process for 

 Etching Daguerreotype plates', by SIR W. R. GROVE, F.R.S., etc. etc. 



10730 LEBOY (Charles Francois Antoine) ANALYSE APPLIQUEE a la GEOMETRIE des TROIS 

 DIMENSIONS, 3 e Edition ; with 5 folding plates, 8vo. hf. calf (binding rubbed), with auto, and 

 bookplate of Sir H. W. Elphinstone, 3s 6d 1843 



10731 TRAITE de GEOMETRIE DESCRIPTIVE, suivi de la Me"thode des Plans cotes et de la 



Theoiie des Engrenages cylindiiques et coniques; 3 Edition augmentee ; with 71 plates, 2 vols. 

 4to. hf. calf (backs damaged), 4s 6d 1850 



10732 LE SAGE (Pierre Charles) RECUETL de divers MEMOIRES extraits de la BIBLIOTHEQUE 

 IMPERIALS des PONTS et CHAUSSEES, a 1' Usage des INGENIEURS; 2~ Edition, augmentee de cinq 

 Nouveaux Me moires Inedits ; with fine portrait of the author, and of J. R. Perronet after Cochin 

 Jilfi, andSG copperplates (many folding), 2 vols. large 4to. russia extra, g. e. (backs slightly rubbed, 

 otherwise a fine copy), 1. 1* 1810 



The first volnme contains interesting memoirs on civil engineering in England, including views of houses in Piccadilly 

 and Oxford Street, and the second a translation of Smeaton's account of the Eddystone Lighthouse, with 4 plates 

 reengiaved. There is also a fine folding view of the Place and Pontde la Concorde, Paris, after Desprez. 



10733 LESCALLIEB (Daniel Baron) TRAITE PRATIQUE du GREEMENT des VAISSEAUX et autres 

 Batimens de Mer ; with 34 fine copperplates (mostly folding), 2 vols. 4to. old calf (rare), 17s Qd 



1791 

 10734 ANOTHER COPY, 2 vols. in 1, old English calf (nice copy], ]8s6d 



An interesting treatise not only on rigging ships, bnt on French naval architecture at a time when it excelled in some 

 respects (and often unwillingly enriched ! ) even that of England. 



10735 VOCABULAIRE des TERMES de MARINE ANGLOIS et FRANCOIS, avec une Explication des 



Figures qui y sont contenues, et des Definitions de quelques Termes de Marine, principalement 

 ceux de Greement ; with 31 fine copperplates and 2 vignettes on copper, to.fne copy in contemporary 

 French calf extra, 15s Imprimerie Royale, Mil 



10736 LE SEUB [sive LE SUEUB] (Thomas, Ord. Min.; commentator on Newton] MEMOIRE 

 sur le CALCUL INTEGRAL, 12mo. (pp. 52), seu-n, 5s 6d Rome, 174S 



' Renfermant des recherches sur la resolution generate des equations. L'auteur fait voir que si 1'on cherche ;'i 

 decomposer enfacteurs le premier nombred'une equation d'un degre superieur au quatiieme, on estamenc a des equations 

 dont le degre est au moins egal.' Bioqr. Gen. 



10737 - , Francesco JACQ,TJIEB, Ord. Min., e Buggiero Giuseppe BOSCOVICH, s. J. : 

 RIFLESSIONI sopra alcuneDiFFlcOLTA spettanti i Danni, e Kisarcimeuti della CUPOLA di S. PIETRO ; 

 with vignette on copper, 4to. (pp. 64), sewn, 6s Qd [ibidem], 1743 



10738 LESOW (William) 'MATHEMATICAL BOOK' (treating of Navigation, Trigonometry, and 

 Dialling), a neatly written MS. on about 300 pp., with numerous very prettily executed 

 diagrams, folio, vellum (back damaged), 3. 3s 1713-14 



Containing Trigonometry, Plane and Spherical, 'Sailing, Plain, Oblick, in Currents, etc. etc, Mercators Sailing, 

 Finding ye Latitude, Doctrine and Projection of the Sphere, Astronomicall Problems, and the Art of Dialling.' 



10739 L'ESPINASSE (Charles, F.R.S.) DESCRIPTION of an IMPROVED APPARATUS for PERFORMING 

 ELECTRICAL EXPERIMENTS, in which the Electrical Power is increased, the Operator intirely 

 secured from receiving any accidental SHOCKS, and the whole rendered more convenient for 

 Experiments than heretofore, with copperplate illustrating the new electrical machine, 8vo. (pp. 3), 

 unbound, 5s 1769 



