BY JOHN TEBBUTT, JUN. 



159 



or thrown upwards by the high coast line, the scud during heavy 

 gales on the coast being often seen at Windsor, to move with 

 great rapidity, while light winds only prevail on the earth's surface. 

 An easterly gale is, I believe, a thing of very rare occurrence at 

 Windsor. The strength of the different winds in various 

 localities is a subject that should be studied, as one means of 

 enabling us to forecast the probable effects of weather at such 

 places. In an interesting communication in the Illustrated 

 London News of December last, on the subject of the gales which 

 marked the last three months of 1863, a writer referred to the 

 circumstance, that the greatest violence of gales might be 

 expected to occur about the time of minimum barometric pressure. 

 Heavy gusts are commonly experienced shortly after the time of 

 least pressure. In connexion with this subject I may say, I have 

 observed that it is not only about the time of the minimum 

 barometric pressure in great storms that the greatest force of 

 wind is experienced. It is well known that in ordinary fine 

 weather the chief daily barometric minimum occurs regularly 

 about 3 p.m., and it happens that this is precisely the hour at 

 which the average strength of the winds is a maximum. In 

 support of this statement I may give the following as the mean 

 force of air currents at Windsor at 9 a.m. noon, 3, 6, and 9 p.m. 

 for the first seven months of the present year. The scale 

 employed in the observations was 6. 



The wind observations of last year were only made at 9 a.m., 

 3 p.m., and 9 p.m., but a comparison of these as also of the 

 observations made at the Sydney Observatory during the past 



