if CONTENTS. 



FEBRUARY. 1813. 



Engravings of the following subjects: l.A new Remontoire Escape- 

 ment for a Pendulum Clock, by Mr. Prior. 2. A method of conveying 



steam from Boilers, by Mr. Webster. 



I.— An Account of some Experiments on different Combinations of Fluoric 

 Acid. By John D?vy, Esq. From the Philosophical Transactions, 

 1812. .. 81 



Il.-r-Obscrvations on the Measurement of three Degrees of the Meridian 

 conducted in England by Lieut-Col. William Mudge. By Don Joseph 

 Rodriguez. From the Philosophical Transactions for 1812, p. 321 . (Con- 

 cluded from p. 334 . Pol. XXXI il J . . . . . . 90 



III. — Critical Observations, on Dr. Wollaston's stated improvement of the 

 Camera Obscura and Microscope in the application of the Meniscus, and 

 two Piano-Convex Lenses ; proving their inferiority to the double Convex 

 Lens generally used. By Mr. William J jnes, Optician 100 



IV. — Rules for discovering new Improvements, exemplified in the art of 

 thrashing and cleaning grain ; Lulling rice ;. warming rooms ; preventing 

 ships iV>;ra sinking,, &c. By Oliver Evans, of Philadelphia 10? 



V. — Useful or Instructive Notions, respecting various o! jects. 1 . Multiply- 

 ing of Copies of Writing. 2. Scintillation of tiie Stars. 3. Large 

 Aeronaut I enses.—W. N .. .. .. .. .. 113 



VI. — An Account of some Experiments on -he Congelation of Mercury, by 

 means of Ether. By A. Marcet, Itf . D. 1 . R. S ' 1 1 9 



VII. — Observations upon the best state in which it is adv.'iable to bring the 

 British Merino Wools to market. By Edward Sheppard, Esq. of Uley, 

 in Gloucestershire. .. .. .. .. .. . . • 121 



VII L — General Results of Beccaria's Observations upon the Electricity of 

 the Atmosphere during serene weather ; together with those of Romayne 

 and Henley. Abstracted by a Correspondent. (R. B.) .. 126 



IX. — Notice of an Adventurer to the Interior of Africa. . . 134. 



X. — Description of a remontoire Escapement for Pendulum Clocks, invent- 

 ed by Mr. George Prior, Jun. .. . . . . 13(5 



XL — Description of a simple, cheap, and easy method of preventing the 

 Annoyance of steam from Boilers in Manufactories and other Places. By 

 Mr. George Webster, of Leeds. .. .. ... 138 



XII. — Meteorological Journal. . . . . . . . . 140 



XIII. — An Explanatory Statement of the Notions or principles upon which 

 the Systematic Arrangement is founded, which was adopted as the basis 

 of an Essay on Chemical Nomenclature. By Professor J. Berzelius. 142 



XIV. — Facts and Remarks upon the Interruption which the situation of 

 the maintaining weight produces in the rate of a Clock when near the 

 Pendulum. By H. K. .. .. .. ... 146 



Scientific News. .. .. .. .. .. 148 



MARCH, 



