76 H. F. Blanford — On a Rain-gauge with Evapometer. [Apiul, 



affecting the density of the atmosphere is change of temperature, after 

 referring to a recent paper by Mr. Douglas Archibald in the Journal of 

 the Meteorological Society of London, in which this view had been revived 

 and established, some additional evidence was adduced in its support ; and it 

 was finally pointed out that, while, as shown in the former part of this paper, 

 the action of cloud and rain was to lower the temperature of the lower 

 strata of the atmosphere, their effect on the higher strata would probably 

 be of the opposite character, which would explain and reconcile the 

 apparent barometric anomaly in question. 



This paper will be published in the Journal, Part II. 



2. Description of a Raingauge with Evapometer for remote and 

 secluded stations (with a Plate). — Bg H. F. Blanfoed, F. R. S., Meteorolo- 

 gical Reporter to the Government of India. 



(Abstract.) 



The paper described a raingauge, intended for use at stations at 

 which there was no resident observer, and which could only be visited 

 at intervals of a month or more ; such as were certain hill- tops and stations 

 in forest tracts. The idea had been suggested by Mr. Hutchins of the 

 Mysore Forest Department in an official letter, which had been sent to the 

 author for report. He had made some additions to the design sent up by 

 Mr. Hutchins, and a gauge had been constructed in accordance with the 

 modified design at the Mathematical Instrument Department, and had 

 been subjected to a year's verification at the Alipore Observatory. The 

 result of this verification was now communicated to the Society. 



The gauge only differed from an ordinary raingauge in having a very 

 large receiver, capable of holding about 30 inches of rainfall. The 

 receiver was surrounded by an outer casing to diminish evaporation, and, in 

 use, was buried in the ground, the mouth being about one foot above the 

 ground level. Accompanying it, was a smaller vessel of the same diameter, 

 but much shallower, and covered with a conical lid having a small perfora- 

 tion at the apex ; which was protected by a small conical cap, to prevent 

 the entrance of rain. This served as an evapometer. In use a measured 

 quantity of water (say = 2 inches of rainfall) was placed in both vessels, 

 and they were then left undisturbed for a month. At the end of that 

 time, the quantity in each vessel was remeasured. The additional water 

 in the guage being added to the loss in the evapometer was assumed to 

 be the total rainfall of the interval. 



A year's verification at Alipore, where the rainfall was also measured 

 daily, showed that the instrument was less accurate than had been hoped, 



