PREFACE. 



The A'vthors of Original Papers in the present Vo- 

 R. L. Edgworth, Esq.; J. G.; Mr. J. Sadler; J. Hors- 

 burgh, Esq.; R. B.; Mr. Charles Sylvester; Jonathan 

 Stokes, M. D.; Rev. Johnson Grant, A.B.; Mr. J.Ben- 

 nett; J. E. Conant, Esq.; Dr. Oersted; Mr. William 

 Skrimshire, Jan.; S. Taylor, Esq.; A Correspondent. 



Of Foreign Works, Professor Ritter; Messrs. De- 

 sormes and Clement; M. Vauquelin; A. Laugier; 

 Professor Proust; Klaproth; Robiquet; Dispan. 



And of English Memoirs abridged or extracted^ 

 C. Hatchett, Esq. F. R.S.; W. H. Wollaston, M. D. 

 Sec. R. S.; Count Rumford, F.R,S.; Mr. W. Wallls 

 Mason; Mr. Gilbert Gilpin; Mr. Thomas Parser; 

 J. C. Curwen, Esq. M. P.; A. Carlisle, Esq. F. R. S. 

 F.L.S.; S. A. Bardsley, M. D.; W. Herschell, LL. D. 

 F.R.S.; Mr. John Mayovv; Mr. W. Smith. 



Of the Engravings the Subjects are, 1. The Furna- 

 ces and Apparatus at present used for refining Lead. 

 By John Sadler. 2. An Odometer, for measuring the 

 Distance run by a Carriage. By R. L. Edgworth, Esq. 

 3. 4. Figures to illustrate the Propagation of Electri- 

 city. By Dr. Oersted. 5. Diagram for describing the 

 Wheels and Pallets of Graham's Escapement for Clocks, 

 By Mr. Bennett. 6. An Escapement of Thiout. 7« 

 Machine for facilitating the Work of Shoemakers. 

 8. An improved Crane. By Mr. Gilbert. Q. Method 

 of using tlie common Chain in Pullies to greater Ad- 

 vantage than Ropes. 10. A Drawing, representing 

 the Structure and explaining the Motion of Fishes. By 

 A. Carlisle, Esq. F. R. S. 11.12. Diagrams to exhibit 

 the proper Motion of the Sun. By W. Herschell, 

 LL. D. F.R.S. 13. A new portable Blow-pipe. By 

 W.H. Wollaston, M.D. Sec. R. S. 14. Plan of Six 

 Acres of Water Meadow, as improved by Mr. William 

 Smith. 15. Improvement in the Striking Part of 

 Clocks. By Mr. Ward. l6. A Machine for cutting 

 the Edges of Books. By Mr. Hawkins. 17. Machine 

 for the transfer of Boats through the Locks of Canals 

 with the least possible consumption of Water. 



