PREFACE. 



Of the Engravings, the Subjects are, 1. Apparatus for 

 raising Water, by Mr. Close. 2 . Furnace for bending Wood . 

 3, 4. Blowing Engine by the Fall of Water at Poullaouen. 

 5, 6. Apparatus for analysing Vegetable Soils, by H. Davy, 

 Esq. 7, Diagrams to explain the Doctrine of Heat, by 

 Count Rumford, V. P. R. S. 8. Magnified Representation 

 of Insects found on Corn, by G. Cumberland, Esq. 9. An 

 improved Steam Engine, by Mr. Clegg. 10. Simple Register 

 Thermometers. 11. The Framing employed to raise the 

 Roof of Clapham Church. 12. An improved Sheep Fold, 

 by T. Plowman, Esq. 1§. Applicative Compass, by Capt. 

 Starck, R. N. 14. Section of a Drain, by J. C. Curwen, 

 Esq. 15. Diagrams to illustrate a Series of Propositions re 

 specting a Division of the Circle, by Mr. John Gough. 16. 

 Schemes exhibiting the Positions of the new Planet Juno, by 

 Dr. Herschel. 17. Mr. Pape's Improvement of Rye Har- 

 bour. 18. A new Air Pump, by Mr. Wright of America. 

 19. New Valve and Parts of a condensing Syringe for the 

 Gases, by Mr. Cuthbertson, with which Mr. Northmore's 

 Experiments were made. 20. A very simple and improved 

 Graphometer, by Mr. Bancks. 



Soho Square, London, January 1, IS 0(5, 



