380 HENRY SOTBERAN & CO., HO, STRAND, W.C., AND 37, PICCADILLY, W. 



7437 EARNSHAW (Thomas ; icatchmaker) LONGITUDE: an APPEAL to the PUBLIC; stating MR. 

 THOMAS EARNSHAW'S CLAIM to the ORIGINAL INVENTION of the IMPROVEMENTS in his TIME- 

 KEEPERS, their Superior Going in numerous Voyages, and also as TRIED by the ASTRONOMER 

 ROYAL [NEVIL MASKELYNE, pr., F.R.S.] by Orders of the Commissioners of Longitude, and his 

 consequent RIGHT to a NATIONAL REWARD, 8vo. (pp. 280 + 36), old calf (some II. foxed] ; rare, 15s 



ap ud auctorem, 1808 



7438 ANOTHER COPY, 8vo. old calf (joint cracked), with inscr. ' From the Author ', 16s 



1 He was the first who succeeded in making chronometers so simple and cheap as to be within the reach of private 

 individuals. He was the inventor of the cylindrical balance spring, and of the detached detent escapement, though in the 

 last he was anticipated in France by L. Berthoud (v Nos. 6168-72, ante). He was one of the competitors for the discovery 

 of the longitude in 1703, when his cause was espoused by Maskelyne. His application was unsuccessful, but the Com- 

 missioner* granted him and John Arnold 3,000 each for the improvements they had made in chronometers." D. JV. R. 



7439 EASSIE (W.) and CO.'s PATENT PILE-DRIVING ENGINES, with 3 large folding plates, 

 besides woodcuts, 8vo. (pp. 2'J), sewn, 2s Qd [1866] 



7440 EBERT (Hermann ; Munich) MAGNETIC FIELDS of FORCE : an Exposition of the Phenomena of 

 Magnetism, Electro-Magnetism, and Induction, based on the CONCEPTION of LINES of FORCE ; 

 trans, by C. V. BURTON, D.SC., PART I, with 93 illustrations, including 2 folding plates, 8vo. el. 

 (out of print), 8s Qd 1897 



The above part, which is intended to serve as an introduction, was the only one translated into English. 



7441 EDE (George) The MANAGEMENT of STEEL, including Forging, Hardening, Tempering, 

 Annealing, Shrinking, and Expansion ; also the CASE-HARDENING of IRON, third Ed., 18mp. 

 boards (scarce), 5s Qd 1863 



'Containing much valuable information for the guidance of those who intend to devote themselves to what was formerly 

 designated 'the mystery of tempering steel' . . . Mr. Ede deserves the thanks of the public for his pains.' 

 John Percy, F.R.S. 



7442 EDGCUMBE (Kenelm, M.I.E.E.) INDUSTRIAL ELECTRICAL MEASURING INSTRUMENTS, with 

 126 woodcuts, 8vo. cl., 5s Qd (p. 8s nett) 1908 



MR. HERBERT SPENCER'S COPY: 



7443 EDGEWORTH (Francis Ysidro, Prof. Political Economy, Oxon.; nephew of Maria Edgeworth) 

 MATHEMATICAL PSYCHICS : an Essay on the Application of MATHEMATICS to the MORAL 

 SCIENCES, 8vo. cl., with HERBERT SPENCER'S BOOKSTAMP on title (scarce), 8s Qd 1881 



' Mainly devoted to the fundamental problem of the mathematical rendering of the ' Calculus of Pleasure ' ; and this is 

 regarded from two points of view, as the ' Economical Calculus ' and the ' Calculus of Utilitarian Ethics.' Acade my. 

 A FINE AND INTERESTING COPY OF THIS RARE PUBLICATION : 



7444 EDINBURGH ESSAYS : ESSAYS and OBSERVATIONS, PHYSICAL and LITERARY, read before 

 a [the PHILOSOPHICAL] SOCIETY in EDINBURGH, and published by them, with numerous folding 

 vlates, 3 vols. 8vo. old calf gilt (FINE COPY) ; VERY RARE, 6. 6s Edin., 1754-71 



This now very rare publication is of great importance as first containing (in vol. II) Dr. JOSEPH BLACK'S classic 

 ' Experiments upon Magnesia Alba, Quick-lime, and some other Alkaline Substances ', a description of which may be 

 found under No. 6248. It also includes the important essay by WILLIAM CULLENT, M.D., F.R.S., ' Of the Cold produced by 

 evaporating Fluids, and of some other Means of producing Cold' ; also ' Of the Cause of th-! Variation of the Ecliptic, 1 

 and one other essay, by COLIN MACLAURIN, F.R s., an Essay by MATTHEW STEWART, F.B.S., and the important essay by 

 THOMAS MELVILL, 'Observations on Light and Colours', containing fundamental experiments in spectrum analysis; 

 besides numerous contributions (some important) on medical and other subjects. 



The above copy is specially interesting for having belonged to RICHARD WATSON, the learned but absentee Bp. of 

 Llandaff, F.R.S., and sometime professor of chemistry at Cambridge University (1737-1816), who has added his autograph 

 on the titles of vols. I and II, and his Calgarth Park bookplate. 



7445 ROYAL OBSERVATORY, ANNALS of, edited by RALPH COPELAND, F.R.S.E., 



Astronomer Royal Scots, Vol. I, with numerous diagrams, 4to. cl., 5s Glasgow, 1902 



7446 SOCIETY'S PROCEEDINGS, from 1878 to 1907 (Vols. IX XXVII), with 'numerous 



plates and woodcuts, 20 vols. 8vo. cl. (v. XXVI missing), 5. 5s Edin., 1878-1907 



7447 EDLIN (A.) TREATISE on the ART of BREAD-MAKING, wherein the Mealing Trade, Assize 

 Laws, and every Circumstance connected with the Art, is particularly examined, ivith folding 

 tables, post 8vo. (pp. 216), boards, 10s Qd 1805 



Dedicated to Count Rurnford. The author, according to Watt, was a surgeon at Uxbridge. It is a valuable book, 

 going fully into the chemistry of bread, its fermentation, the worth of whole-meal bread, the various substitutes for wheat, 

 etc. etc. etc. 



7448 EDWARDS (John, pr.) DIRECTIONS for MAKING the BEST COMPOSITION for the METALS of 

 REFLECTING TELESCOPES ; and the Method of Casting, Grinding, Polishing, and giving them the 

 True Parabolic Figure : ACCOUNT of the CAUSE and CURE of the TREMORS particularly affecting 

 REFLECTING TELESCOPES more than Refracting ones, with Observations by NEVIL MASKELYNE, 

 D.D., F.R.S., Astronomer Royal 2 vols. 8vo. in 1, sewn (some II. soiled) ; rare, 12s Qd [c. 1782] 



' Mr. Edwards's Telescopes shevv a white Object perfectly white, and all Objects of their natural Colors ; very different 

 from common Reflecting Telescopes, which give a dingy copperish Appearance to Objects.' Ncv'd Maskdyne. The first 

 tract was printed by Order of the Commissioners of Longitude. 



7449 EDYE (John) CALCULATIONS relating to the EQUIPMENT, DISPLACEMENT, etc., of SHIPS and 

 VESSELS of WAR, with 31 plates (many folding), roy. 8vo. hf. bound, with auto, of Dr. Francis 

 Etgar, F.R.S., 8s 1832 



Scarce, and unknown to Lowndes and Allibone. 



7450 EELES (Henry ; Lismore, Ireland) PHILOSOPHICAL ESSAYS : in several Letters to the Royal 

 Society, containing a DISCOVERY of the CAUSE of THUNDER, with an Explanation and Demon- 

 stration of the same ; the CAUSE of the Ascent, Station, and Descent of VAPOURS and 

 Exhalations : the Cause of WINDS, and an Explanation of the general PHENOMENA of the 

 WEATHER, BAROMETER, etc. ; the true Rudiments and THEORY of ELECTRICITY and MAGNETISM; 

 and an Attempt to shew that the Electrical Powers are the Cause of the Reflection and 

 Refraction of Light, 8vo. (pp. L + 190), sewn (rare), 15s 1771 



Nothing seems to be known of the author of this curious work, who accuses Dr. Priestley of stealing his doctrine of 

 electricity, and complains that he ' has artfully shut me out of his history of electricity, though nil these paprrs were 

 addressed to the Royal Society, of which he is a member*. The book is specially interesting as probably Hii ilrt to 

 "iMi*>r.t light rtith electricity. nd t1i"* remotely to anlio.ipat" Olerfc.Ma*iVfU' elo c t<-o niaui'-t '<< n.i-ofy nf liKh< . 



