PREFACE. 



A HE Authors of Original Papers in the present Volume 

 are, Sir H. C. Ehglefield, Bart. M. P. F. R. S. ; H. B. K. ; 

 A Correspondent; W. N. j Mr. Sylvester; T. Dalton; 

 J. Kidd, M. D.; J. Bostock, M. D.; Mr. J. Arnold; 

 M.M.; Juvenis; T. B. ; James Horsburgh, Esq.; G. S. 

 Gibbes, M. D.; R. B.; Dr. Buchan ; Dr. Wilkirison; 

 11. Hamili, jun. Esq. ; H. K. ; Count Rumford, F. R. S. ; 

 Mr.Thomas Reid; Mr. W. Hardy ; Dr. Thompson. 



Of Foreign Works, Professor Proust; M. Bouillon La- 

 grange; M. Darcet Cointeraux; Thenard; J. F. Westring; 

 Lavoisier; Laplace. 



And of English Memoirs abridged or extracted, Sir James 

 Hall, Bart. F.R.S. &c. ; Mr. John Arnold; T. Young, 

 M. D. For. Sec. R. S. ; T. A. Knight, Esq.; Thos.Holden; 

 Mr. T. Vanherman ; Mrs. Jane Richardsori; H. Davy, Esq. 

 F.R.S.; W. Brande, Esq.; Mr. Earnshaw\ 



Of the Engravings the Subjects are, 1. A new Lamp, by 

 Count Rumford: 2. The Escapemerit of Arnold's Chrono- 

 meter: 3. Arnold's Expansion Balance for Time- pieces: 

 4, The Water Ram of Mongolfier : 5. Holden's Machine 

 for Shoe-making ; 6. A Galvanic Apparatus, by Mr, Syl- 

 vester: 7. Designs for Furnaces, and Apparatus for ascertain- 

 ing the Force of Compression, by Sir James Hall, Bart. 

 F.R.S. Ed. : 8. Sections and Drawings to illustrate the 

 Huttonian Theory as established on Sir James Hall's Theory: 

 9. Tools and Implements used in building Houses of rammed 

 Earth : 10. Drawing of a Building constructed by that Art: 

 11. TheThermometrical Balance of Peter le Roy : 12. Ex- 

 pansion Balance, by the same Artist : 13. Le Roy's modern 

 detached Escapement: 14. The same improved 5 15. The 

 same as altered by Berthoud : 16. The same by Arnold: 

 17. The same by Earnshaw: 18. Ancient free Escapement, 

 byThiout: 19. New Apparatus by Count Rumford for Ex- 

 periments on Heat: 20. Mr. Harding's Improvement in 

 Time-pieces: 21. The revolving Balance of Robert Hook: 

 22. Diagram, by Mr. Brewster, concerning Achromatic Eye 

 Pieces; 23.Another by Robert HookeconcerningPendulums. 



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