TABLE OF CONTENTS 



TO THIS THIRD VOLUME. 



SEPTEMBER 1802. 



JLvNGRAVINGS of the following Objefts : 1. An Apparatus in which the 

 Flame of a Lamp is very powerfully urged by the Vapour of Alchol j 2. Two 

 new Barometers, by the Rev. James Wilfon, A. M. 5 3. Mr. Befant's im- 

 proved Water Wheel j 4. Mr. R. Phillips's Tubes for driving Copper Bolts 

 into Ships ; 5. An Hydrometer by Mr. Atkins, by which Specific Gravities 

 are exhibited directly without Computation j 6. Very fimple and cheap Pneu- 

 matic Apparatus, by Mr. Read. 



I. Defcription of a cheap and fimple Apparatus or Blow-pipe, in which the 

 Flame of Oil or Tallow is impelled by the Vapour of Alcohol. From a 

 Correfpondent. - Page 1 



II. Outline of the Hiftory of Galvanifm : with a Theory of the Action of the 

 Galvanic Apparatus. By John Boftock, M. D. From the Author. 3 



III. On the fuppofed Exiftence of Mechanical Depofits and Petrifactions, in 

 the Primitive Mountains, and an Account of Petrifactions which have been 

 difcovered in the neweft Flotz Trapp Formation. By Mr. Robert Jamtfon, 

 Communicated by the Author. - - - 13 



IV. A Method of increafing the Senfibility of the Barometer, ad libitum. 

 By the Rev. James Wilfon, A. M. Communicated by the Author. 21 



V. A Summary of the moft ufeful Parts of Hydraulics, chiefly extracted and 

 abridged from Eytelwein's Handbuch der Mechanik und der Hydraulik. 

 Berlin, 1801. By Thomas Young, M. D. F. R. S. - 25 



VI. Experimental Proof, that Corrections deduced from the Arcs of Vibra- 

 tions of a Pendulum in Vacuo, are practically ufeful. By Mr. Ezekiel 

 Walker. 35 



VII. Defcription of an Apparatus of Tufres for facilitating the driving of 

 Copper Bolts into Ships. By Mr. Richard Phillips. 35 



VIII. Reply to Dr. Young's Letter on the Theory of Compound Sounds. In 

 a Letter from Mr. John Gough. - - - 39 



IX. A new Procefs for Claying Sugars, propofed by Cit. Hapel Lachenaie, 

 Chief Apothecary of the Military Hofpitals of Guadaloupetothe Agents of the 

 Confuls of the French-Republic in the Windward Iilands. - 41 



X. Defcription of a Water Wheel. By Mr. J. Beftnt. In a Letter to Mr. 

 Charles Taylor, Secretary to the Society for the Encouragement of Arts. 

 From their Tranfa£tions. - 49 



XI. Defcription of an Hydrometer which gives the Specific Gravity by Infpec- 

 tion, conftrucced by Mr. Atkins. W.N. 50 



XII. On the Air from finery Cinder and Charcoal, with other Remarks on the 

 Experiments and Obfervations of Mr. Cruickfhank. In a Letter from Jo- 

 feph Prieftiey, L. L. D. F. R. S. &c. &c. - - 52 



XII f. Defcription of Mr. Read's Pneumatic Apparatus. By a Correfpon- 

 dent. - - - - ; - - 55 



Scientific News. Experiments of the Invifi>Ie Girl — Aeroftatic experiments of 

 Garnerin — Commercial College at.Jiull — A Syftem of Chemiftry in four Vo- 

 lumes—Death of Thomas. Gr rnet, M. D. late Profeffor of Chemiftry and 

 Natural Philofophy at the Royal Inftitutionj &c. &c. - 56 to 63 



Vo;,, III,— 1802. a OCTOBER 



