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



5143 WADDINGTON (Robert, teacher of the mathematics) PRACTICAL METHOD for FINDING the 

 LONGITUDE and LATITUDE of a Ship at SEA, by OBSERVATIONS of the MOON, with General Rules 

 for computing the same, with all necessary Tables and Explanations, etc. etc., woodcuts, cr. 4to. 

 sewn, 6s Qd 1763 



The author claims to have improved the method of finding the longitude at sea then in use ' by taking the mean of 

 several observed distances for each observation ', and by the compilation of a table ' to obtain the variable quantity of the 

 moon's motion by interpolation.' 



5144 The SEA OFFICER'S COMPANION, containing NEW TABLES for accurately obtaining the 



LATITUDE of a Ship at SEA, and the VARIATION of the NEEDLE, by the MOON, also New Tables 

 to obtain the LATITUDE, by Four different Methods, by the SUN, etc. etc., diagrams, cr. 4to. sewn, 

 5s Downing St., Westminster, 1770 



5145 WAHNSCHAFFE (Felix; Berlin) GUIDE to the SCIENTIFIC EXAMINATION of SOILS, com- 

 prising select Methods of Mechanical and Chemical Analysis and Physical Investigation, trans, by 

 WILLIAM T. BRANNT, illustrated, cr. 8vo. cl., 3s (p. 8* Qd) 1891 



5146 WAITE (Arthur Edward) LIVES of ALCHEMYSTICAL PHILOSOPHERS, based on Materials 

 collected in 1815, and supplemented by recent Researches, with Philosophical Demonstration of 

 the TRUE PRINCIPLES of the MAGNUM OPUS, or Great Work of Alchemical Reconstruction, and 

 some Account of the SPIRITUAL CHEMISTRY, with BIBLIOGRAPHY of Alchemy and Hermetic 

 Philosophy (pp. 30), 8vo. cl. (SCARCE), 15* 1888 



5147 WAKELY (Andrew) The MARINER'S COMPASS RECTIFIED, with the Instruments most in Use 

 in Navigation, and Table of Latitudes and Longitudes, much enlarged by J. ATKINSON, with 

 woodcuts (one moveable) of Astronomical Instruments, etc., 12mo. old sheep, 8s Qd 



W. Mount, on Tower hill, where you may have all Sorts of Sea- Books, 1741 



This copy bears on title the auto, of THOMAS GLASS, M.D. (d. 1786), inventor of a process to prepare magnesia alta, and 

 an authority on inoculation for smallpox. 



5148 NEW EDITION, revised and carefully corrected, with accurate Tables of the Sun's Declina- 

 tion, adjusted to the New-Stile, by WILLIAM MOUNTAINS, F.R.S., woodcuts, 12mo. old calf, 5s Qd 1759 



The editor was ' Teacher of the Mathematics, in Shad -Thames, Southwark. Young Gentlemen Boarded '. 



5149 WALCKIERS de ST. AMAND ( ; de Bruxelles) : RAPPORT fait a 1' Academic Roy ale des 

 Sciences, sur la MACHINE ELECTRIQUE nouvellement inventee par M. Walckiers de St. Amand 

 [par M. J. BRISSON, J. B. LE ROY, N. C. COMTE DE MILLY, et P. S. DE LAPLACE] ; with coloured 



folding plate of the machine, 8vo. (pp. 29), sewn, 1. Is [1784] 



VERY RARE, and unknown to Poggendortt', Querard, Graesse, and other bibliographers, nor contained iu the Ronalds 

 Catalogue. In this machine silk instead of glass is used as the electrifying body, and its sparks are stated to have been 

 from 17 to 19 inches in length the largest hitherto obtained. 



5150 WALDO (Frank) MODERN METEOROLOGY : the Growth and present Condition of some of its 

 Phases, 112 illustrations, post Svo. cl, 2s 1893 



5151 WALDOW (Alexander) ILLUSTRIERTE ENCYKLOPADIE der GRAPHISCHEN KUNSTE und der 

 verwandten Zweige : Buch-, Stein- und Kupferdruck, Lithographic, Photolithographic, Chemitypie, 

 Zincographie, Xylographie, Schriftgiesserei, Sterotypie, Galvanoplastik, etc. etc., herausgegeben 

 unter Mitwirkung bewahrter Fachgenossen ; with plates and numerous woodcuts, roy. Svo. 

 (pp. 911), new hf. calf gilt, 10s Qd (p. M. 23.50 sewn) Leipzig, 1884 



5152 WALKER (Adam) SYSTEM of FAMILIAR PHILOSOPHY, including every material Modern 

 Discovery and Improvement, with 47 copperplates, 4to. (pp. 572), old hf. calf gilt (sound copy), with 

 bookplate of Charles 3rd Earl Stanhope, F.R.S, 10s Qd 1799 



A series of lectures on Physics, Chemistry, and Astronomy, containing original experiments on coaches, etc. etc. by 

 the author, and accounts of his own inventions, including his ' Improved Steam Engine'. 



5153 WALKER (Charles Vincent; F.R.S.) ELECTRIC TELEGRAPH MANIPULATION: the Theory, 

 and Plain Instructions in Transmitting Signals to Distant Places, as practised in England, through 

 Electricity and Magnetism, ivith woodcuts, 16mo. hf. morocco neat (scarce), 5s 1850 



Written when the author was telegraph superintendent to the South Eastern Ry., one of the first lines to use the 

 electric telegraph extensively in England. At this date (1850) the writer says the Brighton Railway had no telegraphs ! 



The book includes a chapter on the Submarine Telegraph. The author also, in conjunction with J. Glaisher and G. B. 

 Airy, introduced the system of electric time-signals from Greenwich Observatory. 



5154 WALKER (Frederick, C.E.) AERIAL NAVIGATION : a Practical Handbook on the Construction 

 of Dirigible Balloons, Aerostats, Aeroplanes, and Aeromotors, with front, and 104 illustrations, 

 post Svo. cl., 4s (p. 7s Qd nett) 1902 



5155 WALKER (George, F.R.S., of Nottingham) TREATISE on the CONIC SECTIONS, with 21 plates, 

 4to. boards, uncut, 5s 1794 



5156 ANOTHER COPY, old tree-calf (rebacked), with inscr. by FRANCIS MASERES, F.R.S., 6s Qd 



Founded on the 24th Proposition of Sir Isaac Newton's ' Universal Arithmetic ', and ' in the construction and demonstra- 

 tion almost wholly original." Preface. 



The author was a very able dissenting minister of Nottingham, and a powerful orator, compared by the third Duke of 

 Portland with Cicero, to the hitter's disadvantage. ' The variety of his interests is shown by his publication of his treatise 

 on Conic Sections while he was agitating against measures for the suppression of public opinion which terminated in the 

 ' Gagging Act ' of 1795.' D. N. B. 



5157 [WALKER (Gen. James Thomas, R.E., F.R.S.; Mutiny hero)] TABLES of HEIGHTS in SIND, 

 the PUNJAB, N. W. PROVINCES, and CENTRAL INDIA, determined by the GREAT TRIGONO- 

 METRICAL SURVEY of INDIA, trigonometrically and by Spirit Leveling [st'ej Operations, to May, 

 1862, with chart, and large map in cover, roy. 8vo. cl., 10s Qd Calcutta, 1863 



' The accuracy achieved was such that the difference between the measured length and the length computed from 

 triangles, commencing 480 miles away at the Calcutta base-line and passing through dense jungles, was but half an inch.' 

 Col. Vetch, R.E. 



5158 [ ] TABLES of HEIGHTS in N. W. PROVINCES and BENGAL, determined by the Great Tri- 

 gonometrical Survey of India, by Spirit Leveling Operations, to May 1865, with chart, roy. Svo. hf. 

 cl., or, cl., 5s Roorkee, 1866 



