Besults of further Experiments on Table Mountain. 101 



any rain was recorded, and utilise for our purposes only those records 

 which are not affected by this error. 



The following Table gives a summary of the results for periods 

 during which no rain was observed : — - 



Woodhead Reservoir. 

 Alt. 2,496 feet. 



Maclear's Beacon. 

 Alt. 3,500 feet. 





Inches. 



Number 

 of days. 



Inches. 



Number 

 of days. 





December, 1903. 

 January, 1904... 

 February, 1904. 

 March, 1904 

 January, 1905... 

 February, 1905. 



1-35 

 1-58 

 2-18 

 3-72 

 3-14 

 2-31 



8 

 5 

 6 

 7 

 12 

 9 



955 

 4-56 

 5-0 



7 

 9 

 5 



Gauge standing in the open 



One of the special questions I wanted to decide in my recent 

 experiments was to ascertain, to what extent reeds and bushes were 

 sheltered by others standing in front of them. For this purpose I 

 had placed one gauge in the open as before, one in the midst of a 

 thicket of bushes 5 feet high, and one in the centre of a field of high 

 reeds, the upper surface of which was level with the top of the frame 

 of the gauge. The gauges near Maclear's Beacon were read weekly, 

 and another one at a lower elevation, viz., in front of the caretaker's 

 house at the Woodhead reservoir, daily, by Mr. Thorsen, who took 

 great interest in the work. The following table gives his observa- 

 tions for one month of each year, the other months being practically 

 of the same nature. 



We found that there was a considerable screening effect exercised 

 by the outer rows of bushes and reeds, especially during short 

 periods of clouds, but that the quantity which did reach the shel- 

 tered gauges during longer periods of south-east clouds was far in 

 excess of the total of the rainfall for the summer months. On an 

 average the gauge in the interior of the thicket of bushes captured 

 about one- third of that in the open, while the gauge which was prac- 

 tically hidden in the reeds collected from one-fourth to one-eighth 

 of the amount recorded by the gauge in the open. 



In connection therewith I may state, that I have checked these 

 figures on several occasions by ascertaining the yield of the gauges 

 during periods of one or two hours only. Sometimes even the gauge 

 in the open captured practically nothing from the passing mist, while 

 on other days one could watch the water dropping in. 



