HENRY SOTHERAN & CO., 140, STRAND, W.C., AND 37, PICCADILLY, W. 205 



4037*ROIAS (Joannes de) COMMENTARIORUM ia ASTROLABIUM, quod Planisphserium vocant, 



Libri VI, nunc primiim in Lucem editi ; additus est INDEX Capitum et Rerum, qua 1 , toto Opere 



continentur, locupletissimus ; handsomely printed in italics ; with numerous fine woodcuts, 4to. 



fine copy in contemporary limp vellum (VERY RARE), 1. 155 Lutetice, 151 



Houzeau-Lancaster No. 3275 ; it was however unknown to Poggendorff and Brunet. 



4058 ROLFE (William James; editor ' Popular Science News'), and J. A. GILLET: ELEMENTS 

 of ASTRONOMY", 4th Ed., enlarged, with coloured spectrum plate, 17 star-maps, and woodcuts, post 

 8vo. cl., 3s New York [1868] 



4059 ROLLWYN (J. A. S.) ASTRONOMY SIMPLIFIED for GENERAL READING, with numerous new 

 Explanations and Discoveries in SPECTRUM ANALYSIS, etc. etc., 20 plates (many coloured), and 

 diagrams, 8vo. cl., 4s (p. 10s 6d) [1871] 



4060 ROMANO (Antonio Luigi de') PROSPETTO delle CONSEGUENZE derivate alle LAGUNE di 

 VENEZIA, ai Porti, ed alle Limitrofe Provincie dopo, la Diversione de' Fiumi analisi e sviluppo della 

 Dottrina, coll' Applicazione al PORTO di MALAMOCCO; with 3 folding plates, 2 vols. 8vo. hf. calf, 

 6s 6d . Venezia, 1815 



4061 ROME de 1'ISLE (Jean Baptiste Louis) ESSAI de CRISTALLOGRAPHIE, ou Description des 

 Figures Gecine" triques, propres a difterens Corps du Regne Mineral, connus vulgairement sous le nom 

 de CRISTAUX ; with 10 folding plates, 8vo. contemporary French mottled calf gitt (RARE), 12s Qd 1772 



This important work first demonstrated the law of constancy of angles in crystallography. 



ROMER (Olaf) De CRASSITIE TUBORUM, et EXPERIMENTA PROJECTIONIS GRAVIUM v. 

 PICARD (J.), ante. 



4062 RONALDS (Edmund, Queen's Coll., Galway), and Thomas RICHARDSON: CHEMICAL 

 TECHNOLOGY, incorporating a REVISION of DR. KNAPP'S 'TECHNOLOGY', 2nd [last] Ed., Parts I 

 and 11 : FUEL and its APPLICATIONS, with 6 plates (2 coloured), and 433 woodcuts, 2 vols. 8vo. cl., 

 uncut, 6s 6d (p. 1 . 16s) 1855 



' The book, which was recognised as a standard work, has been incorporated by C. E. Groves and W. Thorp in their 

 Chemical Technology '.D. N. ]i. 



Prof. Ronalds was a nephew of Sir Francis Ronalds, and though a graduate of Giessen, Jena, Berlin, Heidelberg, and 

 Paris, he was boycotted as a ' tradesman ' by the savants of Edinburgh when he resigned his chair at Galway to take charge 

 of the Bonuington Chemical Works. 



4063 RONALDS (Sir Francis, F.R.S. ; inventor, in 1816, of the electric telegraph) DESCRIPTIONS of an 

 ELECTRICAL TELEGRAPH, and of some other Electrical Apparatus, with 8 plates (one folding) of the 

 Installation and the Electrical Apparatus used, large 8vo. boards, uncut (VERY SCARCE), 

 l.lls6d 1823 



4064 - ANOTHER COPY, hf. calf, 1. 15* 



' Mrs. Edmrt. Ronalds with Sir Fra s Ronalds's kind regards '. Inscr. on title. 

 4065 ANOTHER COPY, with photo-portrait aet. 83 added ; boards, uncut (FRESH COPY), 2. 2s ] 



' T. 8. Whittem, Esq'-e. with the kind regards of Sir Fra. Ronalds '.Inscr. on title. 



This work contains the account of the electric telegraph invented by the author, which transmitted signals from his 

 house at Hammersmith (occupied later on by \VILLIAM MORRIS, the poet, and known as ' Kelrnscott House ') over a system 

 of wires 8 miles long, by observing at one end the divergence of a pair of pith balls when a charge of electricity was sent 

 into the other. 



' Ronalds's instrument was of real practical use, and the brilliant idea of using synchronously rotating discs, now 

 errployel in the Hughes printing apparatus, was entirely his own. The only defect in his invention was the comparative 

 slowness with which a succession of symbols could be transmitted '. D. N. B. He at once offered the invention to the 

 Admiralty, and was officially answered that now the French war was over telegraphs of any kind were totally unnecessary, 

 and that no other than the semaphore then in use would be adopted. The inventor published the above account in 1823, 

 and then dropped telegraphy for good. 



4066 RONKETTI (John G. H., instrument-maker) TREATISE on a NEW DRY and WET BULB 

 HYGROMETER, for measuring the Force and Weight of Aqueous Vapour in the Atmosphere, and 

 the Corresponding Degrees of Evaporation [with Formula and Tables], front., 8vo. (pp. 15), sewn 

 (scarce), Is Qd 1812 



The final form of the hygrometer an improvement on Daniell's which seems to have been invented by Ronketti himself 



4067 RONTQEN (Wilhelm Konrad v.) EINE NEUE ART von STRAHLEN, 2 pamphlets 8vo. sewn, 2* 



Wiirzburg, 1896 

 The first communication of the discovery of X rays. 



4065 RAY SOCIETY (AMERICAN), TRANSACTIONS of the, 1905, with plates and woodcuts, 8vo. 



cl., 4* Philadelphia, 1905 



4039 ROOD (Ogden Nicholas, Columbia Univ.) MODERN CHROMATICS, with Applications to Art 

 and Industry, 2nd Ed., with coloured front., and 130 illustrations, post 8vo. cl., '2s 6d (p. 5s) 1883 



4070 ROOZEBOOM (H. W. Bakhuis, Amsterdam) Die HETEROGENEN GLEICHGEWICHTE vom 

 Standpunkte der PHASENLEHRE ; with 2 plates, and 203 other illustrations, 2 vols. 8vo. sewn, 

 12* Qd (p. M. 18.) Braunschweig, 1901-4 



INBALT : I. Die Phasenlehre. Systeme aus einer Komponente. II. Systeme aus zwei Komponenten. I. Teil. 

 The author's investigations on the chemical theory of phases are of well-known importance. 



4071 ROSCOE (Sir Henry Enfield, F.R.S.) SPECTRUM ANALYSIS: Six Lectures before the Society 

 of Apothecaries of London, with Appendixes, 7 spectrum plates (2 coloured), and 73 woodcuts, 8vo. 

 cl. extra, t. e. g., 3s (p. 1. Is) 1869 



4072 SECOND EDITION [enlarged], with 7 spectrum plates (2 coloured), and 94 woodcuts, 8vo. cl. 



extra, t. e g., 5s (p. 1. 1*) 1870 



4073 - - THIRD EDITION [greatly enlarged], with 10 spectrum and other plates (3 coloured), and 94 

 woodcuts, thick 8vo. cl. extra, t. e. g., Is fid (p. 1. 1*) 1S73 



4074 FOURTH [LAST] EDITION, revised and considerably enlarged by the Author and ARTHUR 



SCHUSTER, F.R.S., with 6 plates (3 coloured), and 119 woodcuts, 8vo. cl. extra, t. e. g., 12s 

 (p. 1. Is) 1885 



4075 ANOTHER CoPY 3 cl., t. e. g. (wormed), 10s 



