( 1232 ) 
M,, semidiurnal lunar tide E—-W. component 
K,, Sun’s-moon’s-declination tide N—S. ee 
O, Moon’s declination tide rs 2 
P, Sun’s declination tide . EN 
K,, Sun’s-moon’s declination tide E—W. En 
M,, semidiurnal lunar tide N—S. 8 
As before, the semidiurnal tides were determined by first measuring 
off the distances between the registrations at 7" and 10", 8> and 
12" ete., and taking the differences (18—10)—(10—7) etc. 
For the diurnal tides the same method was applied to the 
registrations at the hours 16" and 10», 10" and 4" etc. 
The sensitiveness was deduced by determining the period of 
vibration and the indicator-magnification, as explained in the former 
communication. 
As the position of the instrument has not been altered, the former 
values : 
234.3 (E—W) and 185.7 (N—S) 
have been assumed for the indicator-magnification. 
In the different months the following values were found for the 
mean times of vibration : 
K—W N—S 
1909 July 10.0° 10.4 
Aug. 10.1 10:3 
Sept. 10.0 104 
Oct. 9.6 98 
Nov. O7 10.1 
Dec. 9.6° 10.0 
1910 Jan. 9.8 9.8 
Febr. 1007 10:0° 
Mareh 9.5 9.5 
April 9.7 Ory. 
May 9.5 9:5 
June ss ah Oi 
The equivalent pendulum-length as deduced trom these data is: 
| E—W pendulum: 22.70 meters 
N—S : DOO |) ess 
The variation of inclination correspondiug with a deflection ot 
1 mm. in the diagram is accordingly : 
for the E—W component: 0.0388 
> >» N—S_ component: 0.0466 
