64 Mr. G. J. Symons. On Barometric Oscillations [May 8, 



FIG. 3. 



Camden Square, London, August, 1879. 



FIG. 4. 



9A NOON 3P 



9P MID 3A 6A 9A 



Pall Mall, London, August, 1879. 



description was useful, though the completed apparatus has scarcely 

 one feature which even resembles Sir Francis's. 



Before describing the instrument, the author considers it only fair 

 to MM. Richard JbVeres, to state that not only has the apparatus been 

 constructed, but almost wholly invented, by them ; the author decided 

 upon what the instrument was to do, and upon the scales required, 

 but he left the whole constructional details to MM. Richard, and 

 considers the result a great credit to the firm. 



As the primary object of the instrument* is the study of the 

 phenomena of thunderstorms, it has, for brevity, been termed a 

 Brontometer, or Thunderstorm-measurer. 



* Other uses for it are already apparent. 



