SIXTH REPORT — 1836. 



E. 8.E. S. S.W. W. 



f / --\ 



N.N.E. E.N.E. E.S.E. S.S.E. S.S.W. W.S.W. W.N.W. N.N.W. 



( 



N. by E. E, by N. E. by S. S. by E. S. by W. W by S. W. by N. N. by W. 



r 



/ /- 



N.E. by N. N.E. by E. S.E. by E. S.E. by S. S.W. by S. S.W. by W. K.W. by W. N.W. by N, 



It was also proposed that the wind thus registered should be denoted 

 in another manner, for the purpose of showing the combined result of 

 the wind of a considerable period, as a year. This is to be done by be- 

 ginning from a point in a plane (as a sheet of paper) on which the di- 

 rections of the compass are supposed to be represented ; then, drawing 

 a line in the direction of the first wind, and of a length proportional to 

 the quantity- of wind ; from the extremity of this line.^dra-tting another 

 in the direction of this wind and proportional to its quantity ; from the 

 extremity of this another, and so on. The broken line thus obtcdned 

 will represent the course of the wind for the whole time. 



If the course of the wind be thus represented for a year, and then for 

 another year, and so on, there will be a general resemblance among the 

 lines so drawn, because we have, in general, the same winds at the 

 same seasons. The curve line which is the mean of all these lines, or 

 from which they may all be considered as slight deviations, may be 

 called the annual type of the wind. It is very different in different places, 

 as has been observed by writers on meteorology (Kiimtz and others). 

 But there has hitherto been no means of obtaining this course with any 

 degree of correctness, for want of an instrument which could register 

 at the same time the direction and amount of the wind. By means of 

 the present instrument, it is conceived that this difficulty is, in a great 

 mcEisure, overcome. 



One of Mr. Whewell's anemometers is erected at Cambridge, and 

 will be observed regulaih'. Another ■«nll be erected at York, and another 

 at Plymouth ; and the observations -svill be communicated to the ensuing 

 Meetings of the Association. 



It is very desirable that instruments of the same construction, and 

 the same scale, should be erected and observed at other places. Mr. 

 Whewell offers all the assistance in his power to those who are willing 

 to construct and employ this instrument. 



