522 MR OMOND ON THE READINGS OF A BLACK BULB THERMOMETER. 



about 8 a.m. the rise in the diurnal curve becomes well marked. Its minimum is early 

 in the morning, about 5 a.m., but there is no very distinct rise till 8 a.m. Much stress 

 cannot be laid on this point owing to the smallness of the whole shade temperature 

 range and the uncertainty in the value of the Black Bulb scale, as mentioned above, 

 but the comparison of Black Bulb readings of equal intensity at 8 a.m. and 3 p.m. may 

 be trusted so far as to indicate in what direction to look for a more thorough under- 

 standing of the shade temperature diurnal curve. 



