207 



CONTENTS. 



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



For Comparinf) the different Barometrical Scales. 



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



" 11. 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 . 89 



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



" Vlll. 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 . 56 



*' 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 Haeghens . . 81 



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



For Co7-recling Barometrical Observations for Capillary Action. 



" XXIT. 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 Worterb 133 



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



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



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



Baily 134 



C 3 



