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III. -IV. 

 COMPARISON 



OF 



THE METRICAL BAROMETER 



WITH 



THE ENGLISH AND THE OLD FRENCH BAROMETERS, 



OR 



TABLES 



FOR CONVERTING MILLIMETRES INTO ENGLISH INCHES AND DECIMALS, 



GIVING THE VALUES CORRESPONDING TO EVERY MILLIMETRE FROM 250 TO 600 

 AND TO EVERY TENTH OF A MILLIMETRE FROM 600 TO 800 MILLIMETRES. 



19 



