4PO HEXRY SOTIIERAN & CO., 140, STRAND, W.C., AND 43, PICCADILLY, W. 



9767 JAUMANN (Gustav, Briinn) Die GRUNDLAGEN der BEWEGUNGSLEHRE, von einem modernen 

 Staudpunkte aus ; with 124 woodcuts, Svo. sewn, Qs Qd (p. M. 11) Leipzig, 1905 



9768 JEANS (George, pr., Pembroke Coll., Oxon.) PRACTICAL ASTRONOMY for the UNLEARNED [with 

 Astronomical and Optical Terms], illustrated, post 8vo. cl., 2s Qd 1856 



9769 JEAN'S (H. W., F.R.A.S.) HANDBOOK for the STARS: Rules for finding the Names and 

 Positions of all the Stars of the First and Second Magnitude, 2nd Edition, with diagrams, roy. 

 8vo. cl., with auto, of Edward Whymper, 2s 60? 1848 



9770 - THIRD EDITION [enlarged], roy. 8vo. cl., 3s 1868 



9771 JEANS (James Hopwood ; Stokes Lecturer, Cantab. ; F.R.S.) ELEMENTARY TREATISE on 

 THEORETICAL MECHANICS, with 156 diagrams, 8vo. buckram, 5s6d(p. 10s Qd) Boston [Mass., 1906] 



9772 JEANS (James Stephen, Sec. Brit. Iron Trade Assn.) STEEL: its History, Manufacture, 

 Properties, and Uses, with 24 plates (mostly folding), and 186 woodcuts, very thick 8vo. cl., 

 1. Is 1880 



This important work, the first of its kind, is now out of print arid VERY SCARCE. 



9773 JEFFCOTT (Henry Homan ; Roy. Coll. Science, Ireland) NOTES on SCREW THREADS, with 

 dinQrams, 8vo. (pp. 42), sewn, Is Qd 1907 



9774 JEFFREYS (Julius, F.R.S. , F.G.s. ; inventor of the respirator), CONFUTATIVE BIOGRAPHICAL 

 NOTICE of, by LT.-COL. E. JEFFREYS, Bengal Army, with woodcuts, 8vo. (pp. 38), sewn, (scarce), 

 5s 1855 



The ' confutation ' was of a lecturer at the Royal Institution, who had used the opportunity of a Friday Evening lecture 

 there to charge Jeffreys with plagiarising the invention of the respirator, and on other occasions was in the habit of 

 defaming him. 



The pamphlet, by the inventor's brother, is the fullest account of the author, and includes a complete list of his patents 

 on warming and ventilation, boat-lowering gear and various appliances for ships, etc. etc. 



9775 JELINEK (Carl) ANLEITUNG zur ANSTELLUNG METEOROLOGISCHER BEOBACHTUNGEN und 

 Sammlung von Hilfstafeln, mit besonderer Riicksicht auf die meteorologischen Stationen in 

 Oesterreich und Ungarn ; with 17 woodcuts of meteorological instruments, roy. 8vo. hf. calf, 

 4* Qd Wien, 1869 



9776 BAHNBESTIMMUNG des von DE Vico am 24. Janner 1846 entdeckten COMETEN ; 4to. 



(pp. 21), sewn, 2s Qd Prag, 1848 



9777 Ueber den TAGLICHEN GANG der vorzuglichsten METEOROLOGISCHEN ELEMENTE aus den 



stiindlichen Beobachtungen der PRAGER STERNWARTE abgeleitet ; with 6 folding charts, folio, 

 hf. calf, Qs Qd Wien, 1850 



9778 JELLETT (John Hewitt, D.D., Provost T. C. D., P.R.I.A.) ELEMENTARY TREATISE on the 

 CALCULUS of VARIATIONS, with folding plate, 8vo. cl., uncut (cover slightly damaged); VERY 

 SCARCE, 1. 105 Dublin, 1850 



'This valuable work constitutes the only complete treatise on the calculus of variations in the English language . . . 

 We strongly recommend the student to master this important volume.' Todhunter's History of the Calculus of Variations. 

 ' The first really competent presentation of Lagrange's idea is that of Jellett.' Prof. E. Mach. 



v. CARMICHAEL, No. 6736, ante. 



9779 On the PROPERTIES of INEXTENSIBLE SURFACES, 4to. (pp. 35), sewn, with author's inscr., 



5s ibidem, 1853 



Not mentioned in the very inadequate biography of the author in D. N. B. 



9780 TREATISE on the THEORY of FRICTION, with 30 illustrations, 8vo. cl. (scarce), 10s Qd 



ib., 1872 



The only extant treatise in English on the theory of friction, considered as a part of rational mechanics. ' Some of the 

 principles contained in the present treatise are believed to be here enunciated for the first time.' Preface. These include 

 the theory of spinning tops, afterwards completed by Lord Kelvin. 



Dr. Jellett was not only one of the ablest mathematicians of his time in Ireland (which is far from being brought out 

 inhismemoirin D.N.B.), butas apriest wasadevoted servant of the Irish Church throughout the crisis ofDisestablishment. 



9781 JENNINGS (David; Independent Minister, Wapping] INTRODUCTION to the USE of the 

 GLOBES and the ORRERY, 3rd Edition, ivith 5 plates, 8vo. old calf (joints cracked), 4s 1766 



With appendix ' attempting to explain the account of the first and fourth days' work of Creation in the first chapter 

 of Genesis'. 



9782 JENNY (Karl) FESTIGKEITS-VERSUCHE und die da-bei verwendeten MASCHINEN und 

 APPARATE an der k. k. Technischen Hochschule in Wien, I. ABTEILUNG : DRAHTMATERIALIEN, 

 ElSENBLECHE, SCHMIED-, WALZEISEN und STAHLBLECHE ; with Q folding-plates (linen-mounted), 

 and 17 woodcuts, roy. 4to. hf. morocco neat, Qs (p. M. 12 unbound) Wien, 1878 



9783 JENSEN (Gerard J. G., C.E.), BY-LAWS as to HOUSE DRAINAGE and SANITARY FITTINGS 

 made by the LONDON COUNTY COUNCIL, annotated by, and another, woodcuts and map, postSvo. 

 cl., 2s 1901 



9784 - - CAST-IRON HOUSE DRAINAGE, with especial Reference to the Drainage of Town 

 Houses, 185 woodcuts, cr. 8vo. cl.. 3s (p. 4s Qd nett) 1908 



9785 JENYNS [later BLOMEFIELD] (Leonard, pr.) OBSERVATIONS in METEOROLOGY, relating to 

 Temperature, the Winds, Atmosphere, Weather Changes, etc., post 8vo. cl., 2s Qd (p. 10s Qd) 1858 



Including a chapter on ' Weather Prognostications ' (pp. 34). 



9786 JEBNINGHAM (Commr. Arthur William, R.N.) REMARKS on the Means of directing the 

 FIRE of SHIPS' BROADSIDES, with a proposed Method of Controlling and Delivering a SIMUL- 

 TANEOUS CONVERGING FIRE, with coloured plates (10 folding), and map, roy. 8vo. cl., with 

 author's inscr. (SCARCE), 15s 1851 



This seems to be an anticipation of Vice-Adml. Sir Percy Scott's fire-controlling apparatus. 



9787 JEBVIS (Col. Henry Jer vis-White, R.A., M.P.) Our ENGINES of WAR, and how we got to 

 make them, with numerous pretty woodcuts, chiefly from old illustrations (one folding) , large post 

 8vo. cl. (scarce), with author's inscr., Qs 1859 



A good historical sketch, illustrating especially the gradual evolution of firearms. 



9783 JETTEL (Wladimir) Die ZUNDWAAREN-FABRICATION nach dem heutigen Standpunkte ; 

 with 78 woodcuts, roy. 8vo. sewn, Qs (p. M. 10) Wien, 1897 



