PREFACE. 



X HE Authors of Original Papers atld Communications 

 in the present Volume are, G.Cumberland, Esq.; X.; 

 Mr. John Tatum, Jun.; Mr John Webster; Mr. W. 

 Skrimshire, Jun.; G. C. ; John Bostock, M. D.; Mr. J. 

 Hume; R. B.; Mr. Knox ; T. Thomson, M.D. F. R.S. E.; 

 Dr. Hallidaj; Sir H. C. Englefield, Bart. M. P. F. R. S.; 

 David Brewster, M. A. ; A. ; A Constant Reader. 



Of Foreign Worlts, Dr. Carradori; M. Montgolfier; 

 M. Bouillon Lagrange; M. Ch. Hersart; Professor Proust; 

 M. De Lalande; Samuel Mitchell. 



And of British Memoirs abridged or extracted, Mr. JoKp 

 Gough; Mr. William Watson; Dr. J. A. Hamilton, Dean 

 of Cloyne; Rev. James Little; Thomas Andrew Knight^ 

 Esq. F. R. S. ; Matthew Flinders, Esq. ; Mr. W. Hardy; 

 Mr. Andrew Flint; James Smithson, Esq. F. R.S. ; G. 

 Mitchell, M. B.; Patrick Neill, A.M.; Mr. Peter Her- 

 bert; Mr. John Antis; J.C. Curwen, Esq. M. P.; John 

 Pond, Esq.; Sir John Sinclair, Bart. M. P.; Dr. William 

 Roxburgh; Mr. H. Steinhauer; Rev. Peter Roberts, 

 A. M. ; Dr. Cogan; Rev. William Richardson; Mr. 

 George Gilpin ; Mr. S. Grandi ; Mr. Neill Snodgrass ; 

 Thomas Egan, M. D. F. R. S. ; William Alexander, M. D. ; 

 John Alderson, M. D.; Rev. Gilbert Ausein, M. R LA.; 

 Mr. Edward Martin. 



Of the Engravings the Subjects are, L A Diagram by 

 Mr. John Gough, to illustrate the Doctrine of mixed Gases; 

 2. A very simple Scale for Drawing the Vanishing Lines in 

 Perspective, by G. Cumberland, Esq.; 3. Figures by Dr. 

 Herschell exhibiting the singular Outline of the Disk of 

 Saturn; 4. Three Figures exhibiting the Acoustic Experi- 

 ment of the Invisible Girl : 5. An expanding Band Wheel 

 for driving Machinery, by Mr. Flint: 6. A new Door Latch, 

 by Mr. Antis: 7. An improxed Book Case Bolt, by Mr, 

 Peter Herbert: 8 Mr. Hardy's Compensation Balance for 

 a Time Keeper: 9. A Calorimeter for measuring the rela- 

 tive Effects of Fuel, by M. Montgolfier: 10. Apparatus 

 used in the Manufactory of forged Iron Vessels: II. An 

 Astronomical Circle, by Mr. Troughton : 12. A Drag for 

 raising the Bodies of drowning Persons, by Dr. Cogan: 13. 

 Sir H. C. Englefield's Method of adjusting the Transit In- 

 strument: 14. A new Astrometer, by David Brewster, A. M. ; 



15. Mr. Snodgrass's Methods for heating Rooms by Steam; 



16. Apparatus for transferring Gases over Water, Mercury, 

 &c. by the Rev. Gilbert Ausein. T ABLE 



