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



2384 LA HIKE (Philippe de) NOUVEAUX ELEMENS de SECTIONS CONIQUES, les Lieux Geomct- 

 riques, la Construction, on Eft'ection des Equations ; with diagrams, 12mo. old calf gilt (back 

 slightly damaged], with bookplate of Philip 2nd Earl Stanhope, F.R.S., Qs 6d 1679 



2385 NEW ELEMENTS of CONICK SECTIONS : with a Method for their Description on a Plane, 



trans, by BRIAN ROBINSON, with diagrams, 12mo. old sheep, 6s 6d 170t 



2386 THIRD EDITION, diagrams, 12mo. hf. calf (some II. water-stained), 4s 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 Pascal. His innovations stand in close relation with 

 modern synthetic geometry.' Prof. Cajoi^i. 



2387. - TABLES ASTRONOMIQUES, avec les Mouvemens du Soleil, de la Lune, et des autres 

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

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

 tion et 1'Usage des Instrumens d' Astronomic, etc. etc. etc., 3 me Ed. ; with 4 folding plates, besides 

 numerous diagrams, 4to. old vellum (fine copy], 8s 6d 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 COURSES et des SURFACES (Theses), 4to. hf. cL, 

 6s 6d 1877 



2389 LAISSLE (Fr.), et Ad. SCHUEBLER : CALCUL et CONSTRUCTION des FONTS METALLIQUKS, 

 traduit de 1'allemand ; with \Q plates, and 261 woodcuts and diagrams, 2 vols. 8vo. in 1, hf. caff 

 gilt, 5s 6d (p. M. 16. unbound) Stuttgart, 1871 



2390 LALANDE (Joseph Jerome Le Franqois de ; F.R.S.) ASTRONOMIF, premiere edition ; with 

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

 6s 6d 1761 



2391 - SECONDE EDITION, revue et augment^ [avec TABLES ASTRONOMIQUES calculdes pour le 

 Meridien de Paris jusqu'a 1770 (pp. 248)1; with 42 folding plates, 3 thick vols. 4to. old caff 

 gilt, 10s 6d 177 1 



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

 beaucoup de methodes peu repandues.' Biogr. 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, Is 6d Leipzig, 1844 



' [Prof.] A. Williamson [F.R.S.] from his friend Horsford. Giessen, 1845'. Tnscr. on flyleaf. 



2393 TABLES ASTRONOMIQUES calculdes pour le MERIDIEN de PARIS, sur les Observations les 



plus exactes. faites jusqu'en 1770, 4to. old calf gilt, 4s [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, 

 Ss6d " 1863 



De La Landelle's was one of the firsb 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- 

 me'tique et geome'trique, donnant facileraent les Resultats des Operations les plus compliquees de 

 Calcul et de Planimetrie (pp. 64) : INSTRUCTION PRATIQUE pour 1'UsAGE de 1'ARITHMOPLANI- 

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

 inscr., Is Qd 1840 s. d. 



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

 first seven degrees. 



2396 LA LOUBERE [hie LALOVER.A] (Antoine de, s.j.) QUADRATURA CIRCULI et HYPERBOLA 

 SEGMENTORUM, ex dato eorum centro gravitatis, una cum inventione proportions et centri gravi- 

 tatis in proportionibus sphserse plurimorumque periphericorum, nee non tetragonismo absoluto 

 certre cuiusdam cylindri partis . . . demonstrate atque ad calculum reducta, etc. etc. ; with 

 numerous diagrams, thick J2mo. old vellum (rare), 10s 6d Tolosce, 16f>l 



4 Huygens encore fort jeune, demontroit, vers le meme temps, les memes verites.' Montucla. ' He has a claim to 

 distinction in having been the first mathematician to study the properties of the helix.' IF. 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. und deren 

 ANWENDUNG ; with copperplates, 3 vols. 12mo. old caff (rare), 16s 6d Berlin, 1765-72 



'His first research on pure mathematics developed in an infinite series the root x of the equation x+px - '/ His 

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

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



2399 DESCRIPTION d'une TABLE ECLIPTIQUE nouvelle et universelle, 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, 17G/> 



2400 - - INSIGNIORES ORBITS COMET ARUM PROPRIETATES ; with 2 plates: COSMOLOGISCHE 

 BRIEFE iiber die EINRICHTUNG des WELTBAUES 2 vols. sm. 8vo. in 1, old hf. caff gilt (fine 

 copy), ivith bookplate of Charles 3rd Earl Stanhope, F.R.S., 1. Is 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 plus belle et la plus important* decouvertfl 

 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 GEOMETRAL, premiere editio_n; 



ivith % folding plates on copper, large 12mo. sewn, 8s 6d Zuric, 1759 



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

 Monge '.Pro/. Cajori. 



