III. -IV. 



COMPARISON 



OF 



THE METRICAL BAROMETER 



THE ENGLISH AND THE OLD FRENCH BAROMETERS, 



OR 



TABLES 



FOR CONVERTING MILLIMETRES INTO ENGLISH INCHES AND DECIMALS, 

 AND INTO FRENCH OR PARIS LINES ; 



GIVING THE VALUES CORRESPONDING TO EVERY MILLIMETRE FROM 250 TO 600 J 

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



19 



