n CONTENTS. 



JUNE 1805. 



Engravings of the following Objects: 1. Captain Brodie's Method of con- 

 nesting Iron Bars, nnd coating them with Lead j 2.' A Mill bv Mr. Rawlin- 

 ibn, tor grinding Colours more finely and expeditioufly than i^ done by the 

 Stone and Muller ; 3. Apparatus for grinding Indigo, and other dry Mate- 

 rials j 4. Method of banking the Balance of a Time-Piece, by Mr. Hardy: 

 5. A Pyrometer for meafuring the Heat of a Furnace, by Mr. I, G. F. 

 Schmidt, Inftitutor to the Sons of the reigning Prince of Moldavia; G; A. 

 Portable Steam Engine, by Mr, Murray; 7. Apparatus for making the Ga- 

 feous Oxide of Carbon, by Mr. Baruel. 



I. Experiments on the Cafes obtained by the deftrtf6live Diftillation of Wood, 

 Peat, Pit-Coal, Oil, Wax, &c. with a View to the Theory of their'Com- 

 buftion, when employed as Sources of artificial Light; and including Ob- 

 fervations on Hydro-Carburets in general, and the Carho^^ic Oxide : By 

 Mr. William Henry. (Communicated by the Author.) - Page 65 



IL Experiments on the Analyfis of Goulard's Extract, or the Aqua Lithargyri 

 Acetati. By John Boftock, M. D. Communicated by the Author. T'S 



IIL A concife View of the Theory of Refpiration. By William Brande, Efq. 

 From the Author. . - _ _ _ 79 



IV. Inftruftion on the Procefles difcovcred by M. Br^Ile, of Amiens, for 

 watering Hemp in Two Hours Time, in all Seafons, without injuring its 

 Quality. Publifljed by Order of the Minillei- of the Interior of France. 86 



V. Defcription of a Portable Steam Engine. By Mr. Matthew Murray. 93 



VI. Letter from M. J. C. Hornblower, Engineer, on the Meafuie of Force by 

 Horfe Powers. - - - - - 9^5 



VII. Letter from Mr. A. F. Thoelden, communicating three manufcript Table* 

 from Mr. Bode, of Berlin, of the geocentric Places of the new Planets Ceres, 

 Pallas, and Juno, for twelve Months to come. - - 99 



VIII. Letter from Profeflbr Pini, Infpe^.or of Mines to the Italian Republic, 

 to J. C. Delametherie, on Corindon found in Italy. - - 103 



IX. On difclofing the Procefs of Manufactories. In a Letter from Mr. John 

 Clenne'i. - - - - - - 105 



X. Qiieftion refpe6ling the Purification of Copper. By J. P. V/'ith a concife 

 Reply. W. N. - - - - - 107 



XI. Defcription of a Method of connefling Iron Bars, and coating them with 

 Lead, fo as to form folid Pillars for Ligh't-houfes on Rocks covered at High- 

 water, ?nd to defend them from Corrofion. By Capt. Joleph Brodie, of the 

 Royal Navy. - - - - - 108 



XII. Reply to Mr. Accum's laft Letter on the Produ6lion of Nitrous Acid. 

 ByW. F. S. - - - - - 109 



Xlli. Experiments on the Eleflricity of Metallic Filings fifted through Metal; 

 with Remarks in Anfwer to a Letter of Mr. Cuthbertlbn. By Mr. Wm. 

 Wilfon. (From the Author.) - - - -' 110 



XIV. Reply to Mr. Bol'well. By An Old Ccrrefpondent. - 112 



XV. Defcription of an accurate Method of banking the Balance of a Time- 

 keeper. By Mr. William Hardy. Extrafted from his Letter to Charles 

 Taylor, Efq. Sec. to the Society of Arts. - - 114 



XVI. Delcription of a new Apparatus for making the gafiform Oxide of Carbon. 

 Communicated by Mr. Deyuex. - - - - 116 



XVII. Defcription of an improved Mill for levigating Painters Colours. By 

 Mr. James Rawlinlbn, of Derby. - - - 119 



XVII I. A new and cheap Method of purifying Gold and Silver. By A. Thom- 

 loM, Efq. of Banchory, near Aberdeen. In a Letter from the Difcoverer. •i'25 



XIX. Memoir on the Projiagaiion of Sound. By M. Haflenfrarz. 127 



XX. A veiy advantageoas Mode of preparing Muriate of Barytes by the mutual 

 Dccompolition of fulphurated Barytcs and Muriate of Lime. By Mr. 

 Goettiing. - -" . . ♦ - 133 



XXI, 



