126 K. YE. Veselov and V. L. Panteleyev 



Let us AvTite the analogous equation for the moments t^ and tj^: 



From equations (9) and (10) we can find 



It is not necessary to wait for complete abatement of the gravimeter 

 system at each point to find Aq. A minimum of three readings must be taken 

 at certain points in time. This enables the time taken in observation at the 

 point to be considerably shortened. 



The accuracy of finding Aq can be raised by increasing the number of 

 readings and averaging the results of the calculations, and also by working 

 out the results of the measurement by the method of least squares. 



As will be shown below, the gravimeter readings are influenced by the 

 vertical and horizontal accelerations of the motion of the Cardan suspension 

 in addition to the force of gravity. They must be accurately measured to 

 correct the readings for their influence. 



The amplitude value of the vertical accelerations can be found from the 

 very observations made with the instruments for which it is necessary to 

 divide the oscillatory amplitude of the pendulum by the dynamic coefficient. 

 Consequently, in order to find the value of the vertical accelerations, we 

 have to know the value of the dynamic coefficient: 



T) 2 



or 



7 ^0^ 





w-pr _^^ 



4e2;?2 J ' (12) 



1 



V /i 'V-/^' 



2sp \ 8£2p2 



Since in gravimeters Hq^ is usually less than 100 radian/sec and p^ is no 

 greater than a few units, formula (12) can be written in the form: 



A = Ao(l-^v), (13) 



where 



Ac, 



'' ~ 2ep 



