207 



CONTENTS. 



TABLE I. 



II. 



III. 



IV. 



" V. 

 VI. 



" VII. 

 " VIII. 



IX. 



X, 



XL 



XII. 



XIII. 



XIV. 



XV. 



XVI. 



XVII. 

 " XVIII. 

 " XIX. 

 " XX. 

 " XXI. 



" XXII. 

 " XXIII. 

 " XXIV. 



" XXV. 

 " XXVI. 

 " XXVII. 

 " XXVIII. 



c 



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



For Comparing the different Barometrical Scales. 



Comparison of the English and the Metrical Barometers . .11 



Comparison of the English and the Old French Barometers . 15 



Comparison of the Metrical and the English Barometers . .21 



Comparison of the Metrical and the Old French Barometers . 27 



Comparison of the Old French and the English Barometers . 35 



Comparison of the Old French and the Metrical Barometers . 39 



Comparison of the Russian and the Metrical Barometers . . 46 



Comparison of the Russian and the Old French Barometers . 48 



For Comparing Barometrical Differences. 



Conversion of English Inches into Millimetres . . . .53 



Conversion of English Inches into French or Paris Lines . 53 



Conversion of Millimetres into English Inches . . . .54 



Conversion of Millimetres into French or Paris Lines . . 55 



Conversion of French or Paris Lines into Millimetres . . 56 



Conversion of French or Paris Lines into English Inches . ' 56 



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



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



For Reducing Barometrical Observations to the Freezing Point. 



Reduction of English Barometers with Brass Scales . . .65 



Reduction of English Barometers with Glass, or Wooden Scales 72 



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



Reduction of the Metrical Barometer, by Haeghens . . 81 



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



For Correcting Barometrical Observations for Capillary Action. 

 Correction to be applied to English Barometers for Capillary Action 131 

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

 Correction to be applied to Metrical Barometers for Capillary Action, 



by Delcros 132 



Depression of the Barometrical Column due to Capillary Action. 



Pouillet . 133 



Depression of the Barometrical Column due to Capillary Action. 



Gehler's Worterb .133 



Depression of the Barometrical Column due to Capillary Action, 



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



Depression of the Barometrical Column due to Capillary Action. 



Baily . . . ..... . . . .134 



