116 On the Horary Oscillations of the Barometer at Rome. 



more accurately than to hundredths^ which was my principal 

 The positive height of the mercurial column, and con- 



aim. 



sequently the neutral point, were not accurately determined 

 during my stay at Rome, as I had no dividing engine or me- 

 thod sufficiently accurate of measuring off a given quantity ; 

 the position of the scale of inches was therefore only approxi- 

 mate. On my way to Florence the instrument was acci- 

 dentally broke, and I had recourse to the published journal 

 of the Collegio Romano at Rome, to reduce it to the standard 

 of the instrument there observed. I selected sixteen corre- 

 sponding observations at 7ioon in February. 



Feb. 



Sums, 

 Means, 



My observ. 

 Bar. Eng. Inch. 



30.031 

 30.250 

 30.048 

 30.072 

 29.886 

 29.790 

 29.874 

 29.886 

 29.900 

 30.118 

 30.020 

 29.906 

 29.760 

 29.624 

 29.937 

 30.176 



479.258 



29.954 



Ther. 



57 

 58 

 57 

 54 

 54 

 55 

 53 

 52 

 51 

 54 

 54 

 5Q 

 67 

 5i^ 

 53 

 52 



873 



54.6 



=z 5^6.945 Eng. inches. 

 29.954 



DifF. 00.009 



By a very unexpected concordance the difference amounts 

 to only f /ijy of an inch, a variation in this case quite to bg 



