254 HENRY SOTHERAN & CO., 140, STRAND, AA^C, and 37, PICCADILLY, W. 



4998 TYNDALL (John, f.r.s.) The Older Electricity : its Phenomena and Investigators, Notes 

 and Historic Memoranda: Six Lectures at the Royal Institution, 6 parts 8vo. unbound [scarce), 

 45 6c? ' 1884 



An interesting contribution towards the early history of electricity down to Faraday. 



4999 Six Lectures on Light, delivered in America, 1872-3, first edition, with front., and 



59 woodcuts, post 8vo. cL, 3s 1873 



5000 Another Copy, hf. calf gilt, 4s 



5001 Second Edition,* ?^iYA steel portrait of Thomas Young by Adlard after Laicrence, 2^lc(te, 



and 59 woodcuts, post 8vo. cl., Zs (p. 7* 6c?) 1875 



This edition has some new articles in the Appendix substituted for those contained in the first. 



5002 Third Edition [revised], with portrait of Young, plate, and 57 woodcuts, post 8vo. cl., 



3s 6d (p. 75 6^) ' 1882 



5003 Fourth Edition [partly rewritten and shortened], with portrait of Young, and 57 woodcuts, 



post 8vo. cL, 4s (p. 75 6c?) 1885 



5004 Das Light, autorisirte deutsche Ausgabe, hrsg. v. Gustav Wiedemann ; with portrait 



of Young, and 60 woodcuts, 8vo. hf. German morocco, 2-9 Braunschweig, 1876 



5005 Sound : Eight Lectures at the Royal Institution, first edition, with steel portrait of 



Chladni by Adlard, and 169 woodcuts, post 8vo. cl., or, hf. calf, 3s Qd (p. 9^) 1867 



5006 Second Edition, with portrait of Chladni, and 169 woodcuts, post 8vo. cl., 45 (p. 9*) 1869 



This edition contains at end ' Summary of the Recent Researches of M. Regnault ', written by himself (pp. 10). 



5007 Third Edition [greatly enlarged], ^vith front, of fog -siren, portrait, and \^Q woodcuts, 



post 8vo. cl., 5s (p. 105 Qc[) 1875 



This edition tirst contains an account of the author's experiments (as scientific adviser to the Trinity House) at the 

 South Foreland on fog, his invention of the fog-siren [here misspelt ' syren'], etc. 



5008 Sixth [last] Edition [revised], with front. y portrait, and 202 woodcuts, post 8vo. cl., 6* 



(p. 105 Qd) 1895 



' Tyndall discovered that non-homogeneity of the atmosphere affects sound as cloudiness affects light. The atmosphere 

 was also shown to exercise a selective and continually varying influence on sounds, being favourable to the transmissiou 

 sometimes of the longer, sometimes of the shorter, sonorous waves.'— Z). N. B. 



5009 On the Sounds produced by the Combustion of Gases in Tubes, 8vo. (pp. 7), sewn, 



\s Qd 1857 



5010 UFFENBACH (Philipp) De Quadratura Circuli IMechanici, das ist ein neuer, kurtzer, 

 hochniitzlicher und leichter Mechanischer Bericht von der Vierung oder Quadratur dess Circkels, 

 ■svie man solche Kunstrichtig zu Wercke bringen soil ; with fine engraved title, and numerous 

 diagram,s on copper and wood, 2 vols. sm. 4to. in 1, seivn (rare), £1. l5 NUrnberg, 1653 



' Philipp Uffenbach, ein Maler in Frankfurt am Main, lehrte 1653 geometrische Konstruktionen, welche gee'gnet waren, 

 die Liinge des Kreisumfanges nahezu richtig herzustellen.' — Prof. Moritz Cantor. The author thus seems one of the very few 

 circle-squarers whose results were of some i)ractical use. 



Tlie work is rare, and was unknown to Prof, de Morgan, Poggendorif, Montucla, Graesse, etc. 



5011 TJHLAND (Wilhelm Heinrich) Notes et Formules de I'Ingenieur, traduit et annote {sic'] 

 par C. de Laharpe, H. Fontaine, et N. Jarry, 2= Ed., augmentee ; with42\ woodcuts, and map, 

 12mo. hf. calf gilt, 3s 1882 



5012 TJLZER (Ferdinand), and A. FRAENKEL : Introduction to Chemical-Technical 

 Analysis, trans., with Appendix, by Hermann Fleck, illustrated, 8vo. cl , 3s Qd (p. 65 nett) 



Philadelphia, 1898 



5013 UNICORNO (Joseppo, Mathematico) De I'Arithmetica Universale, Parte Prima 

 [e Seconda], nellaquale si contiene non solo la Theorica di tutti i Numeri, ma ancora la 

 Prattica appartenente a tutti i Negotii Humani, trattata, e arapliticata con somma eruditione, c 

 con novi, ed isquisiti modi di chiarezza ; with numerous diagrams, 2 vols. sra. 4to. in 1, old Italian 

 vellum, £5. 55 Venetia, 1598 



An excessively rare work, unknown to Poggendorff, Prof, de Morgan, etc., the second part of which is almost 

 unprocurable. This part consists almost exclusively of commercial arithmetic and bookkeeping. 



' Ouvrage estime, et dont la seconde partie est si rare que Haym assurait qu'elle n'avait pas paru '.— Bnme<. 

 The Libri copy, sold in 1857, fetched 261 francs. 



5014 UNITED STATES Geographical Surveys, West of the 100th Meridian, Report on, in 

 Charge of George M. Wheeler, Vol. II : Astronomy and Barometric Hypsometry, with 22 

 plates {some folding), roy. 4to. cl., 125 6d Washington, 1877 



5015 UNWIN (William Cawthorne; f.r.s.) The Elements of Machine Design, enlarged Ed., 

 with 325 diagrams and woodcuts, thick post 8vo. cl., 25 Qd (p. 65) 1886, or '8 



5016 Lectures on the Distribution of Stre.ss in Beams; on Continuous Web Girders; 



and on IIOOFS, ^vith plates and woodcuts, folio, hf. roan, 5s privately printed, 1868 



5017 Lectures on the Steam Engine, 8 plates: Construction of Railways, 15 plates — 



2 vols, folio in 1, hf. roan, 5s 1868-9 



5018 Treatise on Hydraulics, with 149 illustrations, 8vo. cl., 85 6d (p. 125 6d nett) 1907 



5019 URANIA'S MIBKOB, or a View of the Heavens, 32 cards of constellations, engraved by S. 

 Hall, with the stars accurately perforated according to magnitudes, large 8vo. in 

 cardboard case, \0s Qd ' [c. 1830] 



An excellent practical way of learning the constellations. 



5020 URBANITZKY (Alfred Hitter v.) Electricity in the Service of Man : a Popular and 

 Practical Treatise on its Applications, edited, with copious Additions, by Richard Wormell, 

 revised and enlarged by R. Mullineux Walmsley ; with Intro, by John Perry, f.r.s., nearly 

 870 illustrations, thick 8vo. cl., is (p. 95) ' 1890 



5021 URSIN (QeoTg Frederik Krtiger) Logarithmi VI Decimalium, sc, Numerorum ab 1 ad 

 100.000 et Sinuum et Tangentium ad 10" ; quibus additi sunt varii Logarithmi et Numeri, saepius 

 in Mathesi adhibiti, thick Svo. hf. calf, 3s Qd HafnicPj 1827 



