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



15456 WARD (Jolin, Chief Surveyor and Ganger-General in the Excise) Compendium of ALGEBRA, 

 containing Plain and Easie Rules . . . exemplified by various Problems, with the Solution of their 

 .liquations in Numbers by a new and general Method of resolving all kind of ^Equations, with 

 great Ease and Expedition, very different from all others yet extant, applied to Squaring" the 

 Circle, Making of Sines, Tangents and Logarithms with great P'acility, also Appendix concerning 

 Compound Interest and Annuities; 2nd Edition, corrected, with diagrams, l6mo. old panelled 

 calf {back damaged), 6s J. Taylor^ 1698 



15457 — — Posthumous Works. I. New Method of Navigation by Parallel Parts, by which 

 all Questions in Sailing may be answered with great Expedition and Truth, in a different Manner 

 from Plain, Mercator, and Great Circle Sailing, by the Solution of a plain Triangle only ; also 

 Compendiums of Practical and Speculative Geometry, and of Plain Trigonometry, with their 

 Application to . . . Sailing, etc. II. Doctrine of the Sphere, and Spherical Trigonometry, 

 in which the Construction of the Figures are New, and drawn to represent Solids, by which the 

 Demonstrations are made easy to the meanest Capacity ; 2nd Edition, by George Gordon, with 

 -plate of figures with movable slips, and numerous diagrams, 8vo. old calf Is 6d 1742 



This work was unknown to Watt, Al'libone, and Lowndes. 



15458 — The Young Mathematician's Guide: a Plain and Easie Introduction to the Mathe- 



maticks, Arithmetick, Algebra, the Elements of Geometry, Conick-Sections, and the Arithmetick 

 of Infinites, with Appendix of PRACTICAL GAUGING ; 2nd Edition, corrected, ivith diagrams, 8vo. 

 old calf {binding damaged), 4s 1713 



15459 Sixth Edition, with New Tables of Compound Interest at Five per Cent., with portrait 



cet. 5S by Mynde, and diagrams, 8vo. old calf, 4s 1734 



'This useful course is recommended by Raphson and Ditton.' — Prof, de Morgan. 'A book still in great request, and 

 which has been ever since the ordinary introduction of the greatest part of the mathematicians of this country.'— 

 Dr. Charles Button, F.R.S. 



15460 WARING Jr. (George Edwin, m.i.c.e.) Sewerage and Land-Drainage, 3rd Edition, with 

 29 plates and 75 other illustrations, rov. 4to. cl., 12s (p. €1. 10s) Neiv York, 1891 



15461 WASHINGTON ASTRONOMICAL and METEOROLOGICAL OBSERVATIONS, 



made at the U.S. Naval Observatory, Admls. C. H. Davis, and S. C. Rowan, Superintendents, 

 with the Appendixes, from 1875 to 1882 (Vols. XXII— XXIX), with plates, 8 vols. roy. 4to. 

 in 9, cL, £1. 10* Washington, 1878-85 



15462 WATKINS (Francis, optician to the Prince and Princess of Wales) Particular Account 

 of the Electrical Experiments hitherto made puhlick, with Variety of new ones, and full In- 

 structions for performing them ; with the Description of a compleat JElectrical Machine, and 

 its Apparatus, with the Way of using it, with 3 plates, 8vo. (pp. 78), sewn (rare), Is Qd 1747 



15463 WATSON (Ralph), Brief Explanatory Statement of the Principle and Application of 

 a Plan for preventing- Ships foundering at Sea, invented by, 8vo. (pp. 15), sewn, with inscr. 

 ' From the Author ' {rare), 6s 6d 1827 



The ' invention ' was to have ' Safety Tubes ' of copper of a cylindrical shape, filled with air and hermetically sealed, 

 fixed in the ship. 



There is no copy of this pamphlet in the Library of the Institution of Naval Architects nor was there one in the 

 Scott Collection. 



15464 WATSON (Richard ; Prof Chemistry, Cantab., afterwards absentee Bp. ofLlandaff; F.R.S.) 

 Chemical Essays, 2 vols. 8vo. old tree-calf, 10s Dublin, 1791 



a piratical reprint of the first edition. 



15465 New Edition (Vols. I— III 5th Ed., IV 4th Ed., V 1st Ed.), 5 vols. 12mo. old calf {some 



joints cracked), 12s 6d 1789-91-89 



15466 Seventh [last] Edition ; 5 vols. 12mo. hf calf lOs 6d 1800 



' The most notable essays are (1) ' On the Degrees of Heat at which Water boils ', describing an experiment on the boiling 

 of water, in a closed flask nearly free from air, which has become classical ; (2) ' On Pit-coal ' (1781\ suggesting the con- 

 densing of the volatile products from coke-ovens, an operation which has recently become of great industrial importance ; 

 (3) ' On the Smelting of Lead Ore' (1781), suggesting the condensation of lead fume, and of the sulphurous acid produced 

 In the roasting of 'sulphide ores ; (4) ' On Zinc' (1780),'— iJ. N. B. 



The 'Chemical Essays ' also include the author's contributions to the ' Philoi»ophical Transactions', and the Transac- 

 tions of the Manchester Literary and Philosophical Society, comprising his discovery of the black-bulb thermometer, and 

 his ingenious ' Experiments and Observations on various Phoenomena attending the Solutions of Salts ', which procured 

 his election to the Royal Society. 



15467 Essay on the Subjects of Chemistry, and their General Division, 8vo. (pp. 43), 



sewn, 5s Cambridge, 1771 



15468 Plan of a Course of Chemical Lectures, with tables, 8vo. (pp. 91), sewn, 5s 



ibidem, 1771 



15469 — A Large Paper Copy, roy. 8vo. sewn, 6s 6d 



Bishop Watson's success in chemistry was" at first a remarkable tonr de force, as on his appointment to the chair his 

 acquaintance with the science was absolutely nil, and he muzzed it up (ut aiunt Westmonasterienses) for fourteen months 

 straight away, with the help of experiments with an operator from Paris. He then quickly became a skilled original in- 

 vestigator, as shown above. This hard mental application was unnecessary on his appointment to his next chair, that of 

 the Regius Professor of Divinity, in which, after a manner which should endear him to the editor of the Siiectator, he 

 neglected systematic and historical theology, and lectured out of his inner consciousness. 



15470 WATSON (Sir William, m.d., f.r.s ) Account of the Experiments made by some Gentle- 

 men of the Royal Society, in Order to discover whether Electrical Powhr would be sensible 

 at great Distances, with experimental Enquiry concerning the respective Velocities of 

 Electricity and Sound, and some further Inquiries into the Nature and Properties of 

 Electricity, 8vo. (pp. 90), sewn {rare), Ss 6^ 1748 



* Elaborating his theory of electricity and defining it more closely, quoting at the same time from Franklin's famous 

 letter to Peter Collinson. During 1747 and 1748 Watson, in conjunction with others, carried out a long series of 

 experiments on 'the velocity of electric matter' across the Thames at Westminster Bridge, at Highbury, and at Shooter's 

 Hill, Watson planning and directing all the operations . . . They conceived that the velocity of electricity was 

 'instantaneous'.'— P. N. B. 



