64 Mr John Adie on Dew-point Instruments. 



ing table is — 4.78 degrees. The oblong bulb gives a dew- 

 point 8 or 9 degrees below the truth ; and the mean result from 

 28 observations in the table is — Q.Q degrees. In addition to 

 the objections mentioned by Mr Daniel to this instrument, those 

 here stated regarding the round bulb tend to cause a similar 

 error in its results, though to a less extent. 



Table of the Dew-Point given by the different instruments. 



