CONTENTS. 



m 



NOVEMBER, 180k 



Engravings of the following Objc61s : 1. A Lamp for burning Tallow, by Mr. 

 J. W. Bofwell; 2. An evapointing Furnace, by Curaudau ; 3. A Gripe for 

 the Safety of Carriages, by Mr. Bowler; 4. A perpetual firft Mover; 5. A 

 Jicw parallel Rule. 



I. Defcription of a Tallow Lamp, which regulates its Supply by a fpontaneous 

 Movement., By Mr. John Whitley Bofwell. Communicated by the In- 

 ventor - - - - - - I*3ge 145 



1L Account of a fuccefsful Cafe in which Deafnefs was cured by Pur.6ture of the 

 Membrana Tympani. By M. Maunoir, of Geneva. Communicated by 

 Alexander Marcet, M. D. Phyiician to Guy's Hofpital - 149 



III. Letter from Mr. Timothy Sheldrake, expofing the Errors of M. Tingry 

 refpeding Copal Varniilies; with fine farther Inftru^ions concerning the 

 fame - - - - - - 1^1 



IV. Reply to Mr. Dalton, on the Conftitution of Mixed Gafcs. By Mr, 

 John Gough - - - - - 160 



V. On the apparent Size of the horizontal Moon. In a Letter from Mr. 

 Ezekicl Walker - - - - - 164- 



VI. Defcription of thf Ship Economy, 200 Tons Meafurement, built on the im- 

 proved Con(lru6lion of Mr. J. W. Bofwell - - I6ii 



Vff. Concluding Remarks on the Computation of Tables of Squares and 



Cubes. In a Letter from E. O. - - - 171 



VI U. Letter fro:n C. Wilkinfon, Efq. on Galvanifm and Ele6lricity 175 



IX. Method of preventing Accidents to Hurl'es and Carriages, in going down 

 Hills, by a Gripe or Claip a6ting on the Naves of the Wheels of the Car- 

 riage. By Mr. W. Bowltr - - - - 177 



X. Obfervations and Experiments to elucidate the Operation of the Galvanic 

 Power. By Mr. Chaiies Sylvefter. In a Letter from the Author 179 



Xf. Memoir on the Origin of Wax. By Francois Huber, Member of the 

 Society of Natural Philofophy and Natural Hiftory of Geneva - 182 



Xfl. An Enquiry concerning the Nature of Heat, and the Modes of its 

 Commimication. By Benjamin Count of Rumford, V. P. R. S. Abridged 

 from the Philofophical Tranfailions for J 804 - - 193 



iXlII, Letter from Profelfor Veau-de-Launay to J. C. Delametherie, on fulmi- 

 nating Silver _--.._ 203 

 IV. Pyrotechnic Obfervations, with their Application to evaporating Fur- 

 naces. By Cit. Curadau, Crrrefponding Member of the Apothecaries So- 

 ciety of Paris, and Refident Aflbciate at the Atheneum of Arts 204 



XV. An Account of a curious Phenomenon obferved on the Glaciers of 

 Chamouny; together with fome occalional Obfervations concerning the Pro- 

 pagation of Heat in Fluids. By Benjamin Count of Rumford, V. P. R. S. 

 Foreign Aflbciate of the National Inftitute of France, &c. &c, 207 



XVI. Account of two Sketches; viz. one for a perpetual Motion, and the 

 other of a jointed Parallel Rule, which has no fide Deviation. In a Letter 

 from R. B. - - - - - 212 



XVH. Familiar Account of the Method of ellimating the Value of a Steam- 

 Engine in Horfe-powers as they are called. By a Correfpondent 214 



XVlll. Experiments proving the Neceffity of atmofpherical Oxigen in the 

 Procefs of Vegetation. In a Letter from Mr. John Gough - 217 



Scientific News, Accounts of Books, &c. 221 — Frothing of Oil by Eleftricity, 

 ib. — Native Magnefia, 222 — The Experienced Mill-wrightj or a Treatife 

 on the Conftruflion of fome of the moft ufeful Machines, with the lateft Im- 

 provements. To which is prefixed a fliort Account of the general Principles 

 of Mechanical Powers. Illultrated with forty Engravings. By Andrew Gray, 

 Millwright, ib. — Praftical Obfervations concerning Sea Bathing; to which 

 ?re added, Remarks on the Ufe of the Warm Bath. By A. P. Buchan, 

 M. D, of the Royal College of Phyficians, 22d, 



DECEMBER, 



XIV. 



