TEE RIGIDITY OF THE EARTH 

 FIRST MONTH, SEMI-DIURNAL, E-W CALCULATED 



593 



„ = £l.H3x = +5.o326 ^ = ^^^^^ = +8.0723 



• tan 0j = - = +i .6072 

 a 



«^</ = 58°7' 



J=v/90.3885 



^ = 9.507 



>' = 9.507sin(^+58°7') 



diurnal and diurnal lunar tides only such portions of the observed 

 curves were used as gave complete periods. Under a and c are 

 given the amplitudes and under 0^ and 0c the phase constants for 

 the observed curves and under b and d and 0i and (j)d the correspond- 

 ing quantities for the calculated curves. In taking the means the 

 value for each month is weighted in proportion to the number of 

 periods in the month. Below the mean R and A</) in each case is 

 given the average difference from the mean. At the bottom of 

 each table opposite Y are given the results obtained by computing 

 the tides for the entire year as a single period instead of for a 

 month at a time. The results agree closely with the means for 

 the thirteen months, and are shown graphically in Figures 4 to 8. 

 Violent storms broke down the electric wires during February 

 and March on several occasions, interrupting the electric current 

 for a few hours. The pits cooled, and there were resulting large 



