CONTENTS. 



(The figures refer to the folio at the bottom of the page.) 



For Comparing the different Barometrical Scales. 



Table I. Comparison of the English and the Metrical Barometers . .11 



II. Comparison of the English and the Old French Barometers . 15 



III. Comparison of the Metrical and the English Barometers . .21 



IV. Comparison of the Metrical and the Old French Barometers . 27 

 V. Comparison of the Old French and the English Barometers . 35 



VI. Comparison of the Old French and the Metrical Barometers . 39 



VII. Comparison of the Russian and the Metrical Barometers . . 46 



VIII. Comparison of the Russian and the Old French Barometers . 48 



For Comparing Barometrical Differences. 



IX. Conversion of English Inches into Millimetres . . . .53 



X. Conversion of English Inches into French or Paris Lines . 53 



XI. Conversion of Millimetres into English Inches . . . .54 



XII. Conversion of Millimetres into French or Paris Lines . . 55 



XIII. Conversion of French or Paris Lines into Millimetres . . 56 



XIV. Conversion of French or Paris Lines into English Inches . 58 

 XV. Conversion of Russian Half-Lines into Millimetres . . .57 



XVI. Conversion of Russian Half-Lines into Paris Lines . . 57 



For Reducing Barometrical Observations to the Freezing Point. 



XVII, Reduction of English Barometers with Brass Scales . . .65 



XVIII. Reduction of English Barometers with Glass, or Wooden Scales 72 



XIX. Reduction of the Metrical Barometer, by Delcros . . .73 



XX. Reduction of the Metrical Barometer, by Flaeghens . . 81 



XXI. Reduction of the Old French Barometer, by Kaemtz . . . 124 



For Correcting Barometrical Observations for Capillary Action. 



XXII. Correction to be applied to English Barometers for Capillary Action 131 



XXIII. Normal Height of Meniscus in Millimetres, by Delcros . . 131 



XXIV. Correction to be applied to Metrical Barometers for Capillary Action, 

 by Delcros ......... 132 



XXV. Depression of the Barometrical Column due to Capillary Action. — 



Pouillet 133 



XXVI. Depression of the Barometrical Column due to Capillary Action. — 



Gehler's VVorterb 133 



XXVII. Depression of the Barometrical Column due to Capillary Action, 

 reduced from Delcros's Table ...... 134 



XXVIII. Depression of the Barometrical Column due to Capillary Action. — 

 Baily 134 



