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



13480 POLENI (Giovanni Marchese ; Prof. Padua ; F.R.S.) EPISTOLARUM MATHEMATICARUM 

 FASCICULUS ; with 10 folding plates, 4to. old calf, newly rebacked (partly water-stained), with 

 auto, of Samuel Roberts, F.R.S., 10s 6d Patavii, 1728 



The author's correspondence on astronomical, hydraulic, mathematical and physiological subjects with Manfredi, Guido 

 Grandi, Jacob Hermann, Antonio Conti, and Marinoni. 



'Bella e rara edizione . . . pregevola collezione.' Riccardi. 'A learned and scarce work, frequently quoted in 

 consequence of a recent experiment on the pendulum and the rotation of the earth.' Liliri Catalogue. The author's 

 statue in Padua was one of the first works ot Canova. 



13481 POLLARD (J.), et A. DUDEBOTJT, professeurs a VEcole du Genie Maritime'. ARCHITEC- 

 TURE NAVALE : THEORIE du NAVIRE ; with 3 folding plates, and 764 other illustrations, 4 vols. 

 roy. Svo. hf. green morocco neat, 1. 15s (p. F. 54 nett sewn) 1890-4 



CONTEXU :-"-!. Calcul des Elements Geometriques, des Carenes droites et inclinees. Geometric du Navire : II. Statique 

 et Dynamique du Navire. Roulis en Milieu calme, resistant ou non resistant : III. Dynamique du Navire. Mouvement 

 de Roulis sur Houle. Resistance des Carenes : IV. Dynamique du Navire. Mouvements rectiligne horizontal oblique et 

 eurviligne. Propulsion. Vibrations des Coques des Navires a Helice. 



13482 POLLOCK (Sir Montagu Frederick Montagu-) LIGHT and WATER : a Study of Reflexion 

 and Colour in River, Lake and Sea, with 24 interesting plates from photographs, and 28 diagrams, 

 sq. Svo. el., 5s (p. 10s Qd nett) 1903 



13483 POLONCEAU (Antoine Remy, Inspecteur des Ponts et Chaussees) NOTICE sur 1'AMELIO- 



pour la Police du Roulage 

 DIMENSIONS des CYLINDRES COMPRESSEURS, etc. etc. etc. ; with 5 folding plates, 4to. (pp. 100), 

 sewn, Qs Qd 1844 



The author was the first to introduce macadamising into France on a large scale. He seems to have introduced the 

 heavy roller, a doubtful improvement on McAdam's ramming process ; and also a very tierce-looking mechanical scarifier : 

 both illustrated above. 



13484 PONCELET (General Jean Victor ; de VInstitut, F.R.S.) INTRODUCTION a la MECANI^UE 

 INDUSTRIELLE, Physique, ou Experimentale, 2 e Edition, contenant un grand Nombre de Con- 

 siderations Nouvelles ; with 3 folding plates, 8vo. hf. calf gilt, 3s 6d Metz, 1841 



13485 ANOTHER COPY, mottled calf gilt, 4* 



'Coriolis and Poncelet were among the first promoters of reform in the teaching of rational mechanics.' Prof. Cq/ori. 



13486 MEMOIRE sur les ROUES HYDRAULIQUES a AUBES GOURDES, Mues par-Dessous. suivi 



d'Experiences sur les Effets Mecaniques de ces Roues ; nouvelle Edition, augmentee d'un SECOND 

 MEMOIRS sur des EXPERIENCES en Grand Relatives k la NOUVELLE ROUE, contenant une In- 

 struction Pratique sur la Maniere de proceder a son Etablissement ; with 2 folding plates : 

 EXPERIENCES HYDRAULIQUES sur les Lois de PECOULEMENT de 1'EAU a travers les Orifices 

 Rectangulaires Verticaux a Grandes Dimensions, entreprises si Metz par MM. PONCELET et 

 LESBROS ; wifh 7 folding plates 2 vols. 4to. in 1, hf. brown morocco gilt (fine copies] ; SCARCE. 

 1. Is Metz, 1827 Paris, Imprimerie Eoyale, 1832 



The first memoir contains the invention of the water-wheel known by the author's name, an undershot wheel with 

 curved floats, which is still the best when the fall does not exceed 6 feet. ' The principle of this wheel lies in the water 

 being received by the curved floats without any shock and finally discharged with small velocity-' The Poncelet wheel 

 utilises 60 % of the water power, against 25 % with the ordinary undershot wheel. 



13487 RECHERCHES sur le CALCUL des SERIES, ou Application de la METHODS des MOYENNES 



a la TRANSFORMATION au Calcul Numerique et a la Determination des Limites du Reste des 

 Series : with plate, 4to. (pp. 88), sewn, 3s Qd 1833 



13488 TRAITE de MECANIQUE INDUSTRIELLE, exposant les Principes de Statique et de 



Dynamique, les Organes Mecaniques et les Moteurs ; with 25 folding plates, 8vo. calf, 3s 6d 



Bruxelles, 1839 



13489 DEUXIEME EDITION, entierement corrige'e et contenant un grand Nombre de Con- 

 siderations Nouvelles ; with %% folding plates, 3 vols. large Svo. in 1, hf. calf (wanting title of 

 v. Ill), 4s Liege, 1845 



The Traite is a Belgian reprint of the above Introduction, with the addition of a number of plates. 



13490 TRAITE des PROPRIETBS PROJECTIVES des FIGURES ; with 12 plates, 4to. sewn, uncut. 



8s 6d 1822 



'Long one of the best-known text-books on modern geometry. By means of projection, reciprocation, and homologous 

 figures he established all the chief properties of conies and quadrics. He also treated the theory of polygons.' 

 W. W. R. Ball. 



' He investigated in it the properties of figures which remain unaltered by projection, which is not effected here by 

 parallel rays of prescribed direction, as with Monge, but by centre projection. ... To him we owe the Law of Duality as 

 a consequence of reciprocal polars.' Prof. Cajori. 



The work was written in 1813 while the author was a prisoner of war in Saratoff, with no other help than his memory. 



13491 PONTECOULANT (Philippe Qustave Doulcet Comte de) THEORIE ANALYTIQUE du 

 SYSTEMS du MONDE, avec les Supplements aux Livres II et V, 4 vols. Svo. neiv hf. brown calf 

 gilt (SCARCE), 1. 155 1829-46 



Vol. IV, containing the Lunar Theory, is now very scarce. Vols. Ill and IV have never been reprinted. 



13492 TOMES 1 1\ III, avec les SUPPLEMENTS aux Livres II et V, 3 vols. Svo. hf. calf gilt, 12.9 



1829-34 



13493 LES MEMES, avec les SUPPLEMENTS, 3 vols. Svo. in 2, hf. calf (worn and soiled copy], 8s 



13494 [PONTH^US \Italice PONTE] (Josephus Dionysius)] COMETRIC^: OBSERVATIONES 

 habitae ab Academia Physico-mathematica Romana, Anno 1680 et 1681 ; with fine star-maps by 

 N. Billy, sm. 4to. extra boards (fine copy] ; RARE, 12s Qd Romce, 1681 



One of many accounts of the comet of 1680, which from its nearness to the earth greatly terrified the people. The same 

 comet was also observed by Sir Isaac Newton, whom it enabled to demonstrate that comets as well as planets are 

 subject to the law of gravitation. Cometary astronomy, till then neglected, now entered on a new and more prolific era. 



The above account is rare and was unknown to Houxeau and Lancaster ; nor is the author mentioned by Poggendorff 

 and other bibliographers. 



