60 



EFFECTS OF WINDS AND OF 



44 miles per hour between 4 and 5 p.m. Note, also, the large changes 

 produced by a change of 45 in the wind direction. 



The last column of table No. 11, headed W, is explained later. It is not 

 intended for consideration at this point. 



The observed elevations of the water surface at the Buffalo gage at each 

 hour, as read from the automatic gage record of the Lake Survey, the 

 hourly barometric effects as computed according to pages 32-36, and the 

 corrected elevation of the water surface at each hour as it would have been 

 if no barometric effect had occurred are shown below. 



TABLE No. HA. Buffalo, August 5, 1910. 



The observed elevations are referred to mean sea-level. 



The values of L, see equation (66) , page 56, as recorded in the observation 

 equations shown on page 58, in units of 0.01 foot, were obtained by sub- 

 traction of adjacent values of the corrected elevations shown above. The 

 absolute term L, in each of the two observation equations, for the hours 

 3 and 4 a.m. and for the hours 5 and 6 a.m., is the corrected rise for two hours 

 instead of one. 



