776 HENRY SOTHERAN & CO., 140, STRAND, W.C., and 43, PICCADILLY, W. 



15426 WADDELL (John Alexander Low, c.e., Univ. Tokio) The Designing of Ordinary Iron 

 Highway Bridges, with diagrams and ^2 folding tables, large 8vo. cl. (o. p.), 6s 6d (p. £1. Is) 



New York, 1884 



15427 '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 tvoodcuts, 16mo. pictorial wrapper (scarce), 5s 1850 



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

 electric telegraph extensively in England- At this date (1S50) the writer says the Brighton Railway had no telegraphs ! 



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

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



15428 Electrotype Manipulation : being the Theory, and plain Instructions in the Art of 



Working in Metals by precipitating them from their Solutions through the Galvanic or Voltaic 

 Electricity, with woodcuts, 16mo. sewn (scarce), 4s 1841 



This is probably the earliest English work on electrotyping, as M. H. v. Jacobi did not publish his invention until 

 1S40 (v. no. 9709-10 ante). 



15429 WALKER (Frederick, c.e.) Aerial Navigation : a Practical Handbook on the Construction 

 of Dirigible Balloons, Aerostats, Aeroplanes, and Aeromotors, with frontispiece and 104 illustra- 

 tions, post 8vo. cl. 2s 6d (p. Is 6d nett) 1902 



15430 Second Edition, revised and enlarged, with 123 illustrations, post 8vo. cL, Hs 6d 1910 



15431 WALKER (James, Univ. Edin., F.R.S.) Introduction to Physical Chemistry, third 

 Edition [enlarged], with 50 illustrations, 8vo. cl. os (p. 10* nett) 1903 



15432 The Theory and Use of a Physical Balance, with 3 folding plates. 8vo. sewn, 2s 



Clarendon Press, Oxford, 1887 



15433 [WALKER (Obadiah)] Propositions concerning Optic Glasses, with their natural 

 Reasons, drawn from Experiments, with vignette of the Sheldonian Theatre on title, and 38 

 diagrams, sm. 4to. (pp. 46), hf. brown calf, uncut (fine copy) ; RARE, 17* Qd 



Oxford, at the Theater, 1679 

 An elementary work which seems to have sufficed for the needs of a university education in the latter end of the 

 Seventeenth Century. 



The author was Master of University College, Oxford, and went over to Rome on James II. 's accession, who 

 charged him with the uphill task of Romanising the University. Walker only succeeded however in getting ' the curses 

 of all both great and small' (Anthony d Wood), a sentiment also expressed in some contemporary doggerel, which was sung 

 by the undergraduates : 



' Oh, old Obadiah 

 Sing Ave Maria 

 But so will not I a 



for why a 

 t had rather be a fool than a knave a.' 



15434 WALKER (Ralph) Treatise on Magnetism, with Description and Explanation of a 

 Meridional and Azimuth Compass, for ascertaining the Quantity of Variation, without any 

 Calculation whatever, at any Time of the Day, also Improvements on Compasses in General, 

 with Tables of Variation, for all Latitudes and Longitudes, with 1 folding plates, 8vo. calf gilt 

 (one joint cracked, and title mounted), Is 6d 1794 



15435 — Another Copy, hf. calf, tvith auto, of John Lee, of Hartwell, Q.C., F.R S., 9? 



Chiefly valuable for the fall tables of variation (pp. 139), compiled from observations between 1760 and 1780. 



15436 WALKER (Comm. William, r.n.) The Magnetism of Ships, and the Mariner's Compass : 

 a Rudimentary Exposition of the Induced Magnetism in Sea-going Vessels, and its Action on 

 the Compass, etc., with woodcuts by L. F. W. Jewitt, F.S.A., 12mo. cl. (scarce), 5.9 1853 



Pp. 1-20 contain an interesting history of the mariner's compass. There is also an account of the author's own 

 compensated compass ; with an appendix of official reports. 



15437 WALLACE (William, f.r.s.e., Univ. Edin.) Investigation of Formula, for Finding the 

 Logarithms of Trigonometrical Quantities from one another, and a proposed Improvement 

 in the Solution of a Case in Plane Trigonometry, 4to. (pp. 23), sewn, 2s 6d Edin., 1823 



15438 New Series for the Quadrature of the Conic Sections, and the Computation of 



Logarithms, with plate, roy. 4to. (pp. 78), sewn, with inscr. to Nevil Maskelyne, pr., f.r.s., 

 4s Qd ibidem, 1808 



15439 WALLACE (William) The Laws which regulate the Deposition of Lead Ore in Veins ; 

 illustrated by an Examination of the Geological Structure of the Mining Districts of Alston 

 Moor, with 21 lithojraphic views and plans (some coloured or folding), 8vo. cl. (map wanting); 

 scarce, 7s Qd 1861 



15440 WALLACH (Otto ; Univ. Gottingen) Terrene und Campher : Zusammenfassung eigener 

 Untersuchungen auf dem Gebiet deralicyclischen KohlenstofiVerbindungen, large 8vo. sewn, loith 

 inscr. to Prof. W. H. Perkin, F.R.S. , 12s (p. M. 18) Leipzig, 1909 



a systematic account of the author's important researches on essential oils, made between 1SS5 and 190S, and con- 

 taining a new claKsification of terpenes. 



15441 WALSH (Francis) The Antediluvian World : or a New Theory of the Earth : contain- 

 ing a clear Account of the Form and Constitution of the Terrestrial Globe before the Universal 

 Deluge; proving it to be quite different from what it is at present; with the Origin and 

 Causes of the said Deluge, Subterraneous Cavities, Seas, Islands, Mountains, etc., with ivoodcuts, 

 8vo. old calf (rare), Ss 6d Dublin, 1743 



This grand defence of the Deluge and curious geological paradox was unknown to Watt, Lowndes, AUibone, and other 

 bibliographers. 



15442 WALTER (Thomas) New Mathematical Dictionary : the Explication of all the Terms 

 in Pure and Mixed Mathematics, the Explications, Uses, etc. of the most considerable Instru- 

 ments, Engines, and Machines, with the Elements of Geometry, ivith 3 plates and diagrams, 8vo. 

 cl.,5s ^ /- ^^^g2] 



