ON THE RAINFALL IN THE BRITISH ISLES. 



467 



RAIN-GAUGES (mitinued). 



■when tested is the error of the gauge given in the 

 last cohimn but two ; the last columns are self-ex- 

 planatory. 



A section is given of Gauge No. 172, it being of 

 a tyi^e not represented on the Plate, yet of consider- 

 able importance, inasmuch as it is the pattern em- 

 ployed by Mr. Fletcher, F.R.S., on the Cumberland 

 Mountains. The orifice is small, only 4 inches, in 

 order to keep the volume of water within manage- 

 able limits ; they are constructed with very thick 

 double-lapped copper vessels dropped into stout iron 

 cans provided with lock and hinges ; the amount is 

 measured with a glass like No. III. 



c, c are handles, D is a hinge, and A E D falls down close 

 on the body B. 



2i2 



T-i-i -i' 



f^— ■ 



Scale of inches. 



