2 HARBOUR CONSTRUCTION. 



I propose, therefore, in this chapter, to direct the reader's 

 attention to that section of meteorology which treats of wind, as 

 having a direct and important bearing upon the main subject of 

 this work. 



Diagrams, constructed so as to show at a glance the pre- 

 vailing daily direction and force of winds, extending over as 

 long a period as possible which should, at the least, embrace 

 one whole year will be found useful in considering any design 

 for sea- works. The patterns of such diagrams are multiform, 

 but the following (Figs. 1 and 2) are given as examples, 



SCALE OF DAYS 

 5 10 15 



20 



<T5 part of an inch, measured on the radial lines, equals one day. Thus, 

 during the months of April, May, and June, the direction of the wind was 

 dut north on 6 days, and due south on 19 days. 



Lines thus O e indicate observations for January, February, March. 



April, May, June. 

 ,, J"fyi August, September. 



M ,, October, November, December. 



FIG. 1. Wind diagram for Peterhead, year 1889. 



