28 



EEPORT AND OBSEEVATIONS ON EAIN, ETC 



Mr, Ecroyd's gauge is exactly similar to that used eo long 

 by the late Dr. Dalton, and placed at Mayfield, in Manches- 

 ter. J^he rain is received from a large funnel into q gradu- 

 ated vial or cylindrical receiver of smaller area than the 

 funnel, and graduated accordingly. When the quantity is 

 measured the receiver is emptied. Mr. Ecroyd's gauge 

 stands about four feet from the ground; it is placed in an 

 exposed situation in his garden, near Castle-hill, about half 

 a miJo to the south-west of Rochdale. The garden is on the 

 top of the hill forming the southerly summit of the valley of 

 the river Roch, probably about 600 feet above the level of 

 the sea, and is little more than half a mile from Moss Lock 

 on the Rochdale Canal. The correctness of the observations 

 are said <^o be corroborated by those of Mr. Haworth, who 

 keeps. a similar gauge nearer Moss Lock: the variation be- 

 tween the two is stated to be very slight. 



As bearing upon the accuracy not only of the observar* 

 tions of the Rochdale Canal Company, but of those instituted 

 by the Society, these observations are very important. 

 They sJiow a much larger fjall of rain than has been regis- 

 tered at Moss Lock, and go far to prove that the index rods, 

 in rising above the tops of the gauges put down by the 

 Society, have not materially, if at all, influenced the returns. 

 The following table will afford a comparison : — 



l^ 



//•^' 



It 16 not easy to account for the great discrepancy. It 

 may be that Mr. Eeroyd and Mr. Haworth are pniore accu- 

 rate observers than the lock-keeper of the Canal Company. 



