120 HENRY SOTHERAN & CO., 140, STRAND, W.C, and 37, PICCADILLY, W. 



2384 LA HIRE (Philippe de) NouvEAUX Elemens de Sections Coniques, les Lieux Geoinet- 

 riques, la Construction, oil Eftection des Equations; ivith diagramSy 12mo. old calf gilt [back 

 slightly damaged), with bookplate of Philip 2n.d Earl Stanhope, F.R.S., 6s Qd 1679 



2385 New Elements of Conick Sections : with a Method for their Description on a Piano, 



trans, by Brian Robinson, toith diagrams, 12mo. old sheep, Qs Qd ]70t 



2385 Third Edition, diagrams, i2mo. hf calf {some II. water -stained), 45 1729 



'His work on conic sections is purely synthetic, but differs from ancient treatises in deducing the properties of conies 

 from those of the circle in the same manner as did Desargues and Tascal. His innovations stand in close relation witli 

 modern synthetic geometry.'— Pro/. Cajori. 



2387 Tables Astronomiques, avec les Mouveniens du Soleil, de la Lune, et des autres 



Planetes, deduits des seules Observations, et independamment d'aucune Hypothese ; la Methode 

 du Calcul Astronomique, et le Calcul des Eclipses par la seule Trigonometric rectiligne ; la Descrip- 

 tion et rUsage des Instruniens d'Astronomie, etc. etc. etc., 3"^® Ed. ; unth 4 folding plates, besides 

 numerous diagrams, 4to. old vellum {fine copy), ^s Qd 1735 



Containing a description of a machine of the author's invention showing the theory of eclipses. 



2388 LAISANT (Charles Anne) Applications Mecaniques du Calcul des Quaternions. Sur 

 un Nouveau Mode de Transformation des Courbes et des Surfaces (Theses), 4to. hf cL, 

 65 Qd 1877 



2389 LAISSLE (Fr.), et Ad. SCHUEBLER : Calcul et Construction des Ponts Metalliques, 

 traduit de Faliemand; with \Q plates, and 261 woodcuts and diagrams, 2 vols. Byo. in 1, hf. calf 

 gilt, 5s Qd (p. M. 16. unbound) Stuttgart, 1871 



2390 LALANDE (Joseph Jer6me Le FranQois de; f.r.s.) Astronomie, premiere edition; with 

 ^% folding plates, 2 thick vols. 4to. hf vellum, with bookplate of Philip 2nd Earl Stanhope, F.R.S. , 

 65 Qd , 1764 



2391 — — - Seconde IEdition, revue et augment6e [avec Tables Astronomiques calcul^es pour le 

 Meridien de Paris jusqu'h, 1770 (pp. 248)] ; with 42 folding plates, 3 thick vols. 4to. old calf 

 gilt, \0s Qd 177 1 



'Get ouvrage, qui est son principal titre de gloire, est un repertoire complet de tout ce que Ton savait alora et de 

 beaucoup de methodes peu repandues.'— iJiogrr. Gen. He determined the parallax of the moon on a voyage to the Cape of 

 Good Hope. 



2392 Logarithmisch-TRIGONOMETRISCHE Tafeln, herausgegeben von H. G. Kohler, 24mo. 



boards, \s Qd Leipzig, 1844 



' [Prof.] A. Williamson [f.r.s.] from his friend Horsford. Giessen, 1845'.— Jwscr. on flyleaf . 



2393 Tables Astronomiques calcul^es pour le Meridien de Paris, sur les Observations les 



plus exactes, faites jusqu'en 1770, 4to. old calf gilt. As [1771] 



2394 LA LANDELLE (Guillaume Joseph Gabriel de) Aviation, ou Navigation Aerienne ; 

 with vignette of the author's remarkable aeroplane, post 8vo. sewn {some II. water -stained) ; scarce. 

 8* Qd 1863 



De La Landelle's was one of the first aeroplanes suggested, driven and lifted solely by steam power. The rather fan- 

 tastic machine had the form of a ship, the hull flanked with aeroplanes, and 2 masts, each carrying four sets of screws an I 

 a partly folded umbrella to open if needed into a parachute. 



2395 LALANNE (Leon Louis Chretien) Memoire sur I'Arithmoplanimetre, Machine arith- 

 ni(5tique et geomdtrique, donnant facilement les Rdsultats des Operations les plus conipliquees de 

 Calcul et de Planini^trie (pp. 64) : INSTRUCTION Pratique pour I'Usage de I'Arithmoplani- 

 metre (pp. 8) — 2 parts 8vo., with 2 folding plates of the machine, and table ; sewn, ivith author's 

 inscr., Is M 1840—5. d. 



An account of this ingenious but now forgotten calculating machine, which solved numerical equations of the 

 first seven degrees. 



2396 LA LOUBi^RE [hie LALOVERA] (Antoine de, s.j.) Quadratura Circuli et Hyperbolae 

 Segmkntorum, ex dato eorum centro gravitatis, una ciim inventione proportionis et centri gravi- 

 tatis in proportionibus sphcerje plurimorumque periphericorum, nee non tetragonismo absoluto 

 certte cuiusdam cylindri partis . . . denionstrata atque ad calculum reducta, etc. etc. ; with 

 numerous diagrams, thick ]2mo. old vellum {rare), \0s 6d Tolosa, 1651 



* Huygens encore fort jeune, dcmontroit, vers le m6me t«nips, les memes xknienJ'—Montucla. ' He has a claim to 

 distinction in having been the first mathematician to study the properties of the helix.' — W. W. R. Ball. 



2397 LAMB (Horace, f.r.s ) Elementary Course of Infinitesimal Calculus, with numerous 

 diagrams, thick post 8vo. cl., Qs (p. 12s) Univ. Press, Cambridge, 1897 



2398 LAMBERT (Johann Heinrich) Beytrage zum Gebrauche der Mathematik. unci deren 

 Anwendung ; with copperplates, 3 vols. 12nio. old calf {rare), 165 Qd Berlin, 1765-72 



'His first research on pure mathematics developed in an infinite series the root x of the equation x^^+px = q. His 

 results stimulated Euler and Lagrange. ... To the genius of Lambert we owe the introduction into trigonometry of 

 hyperbolic functions, which he designated by sink x, cosh x, etc.'— Prof. Cajori. 



2399 Description d'une Table Ecliptique nouvelle et univer.«elle, avec la Maniere de s'en 



servir, et une Methode facile pour le Calcul et la Projection des Eclipses, etc. ; with 2 folding 

 tables, 12mo. old hf calf, 6s ibidem, 17 Go 



2400 INSIGNIORES Orbits Comet arum Proprietates ; with 2 plates: Cosmologische 



Briefe liber die Einrichtung des Weltbaues— 2 vols. sra. 8vo. in 1, old hf. calf gilt {fine 

 copy), with bookplate of Charles Srd Earl Stanhope, F.R.S., £1. 1* Augspurg, 1761 



First Editions of both Works. The first contains Lambert's celebrated theorem on the movement of comets for the 

 area of a focal sector of a conic in terms of the chord and the bounding radii : ' la jjIus belle et la plus importante decouverte 

 de la theorie des cometes ' {Lagrange) ; while the second ' laid the foundation of what may properly be called a science of 

 the stars ' {Agnes M. Clerke). 



2401 La Perspective affranchie de I'Embaras du Plan G^ometral, premiere edition; 



ivith S folding plates on copper, large 12mo. sewn, 8s Qd Zuric, 1759 



' Containing researches on descriptive geometry, and entitling him to the honour of being the forerunner ot 

 Monge '.—Prof. Cajori. 



