[別館]球面倶楽部零八式markIISR

東大入試数学中心。解説なので解答としては不十分。出題年度で並ぶようにしている。大人の解法やうまい解法は極めて主観的に決めている。

1921年(大正10年)東京帝國大學理學部(物理科)英語

The great importance of the results obtained by means of the pendulum has induced philosophers to devote so much attention to the subject, and to perform the experiments with such a scrupulous regard to accuracy in every particular, that pendulum observations may justly be ranked among those most distinguished by modern exactness.
(Stokes)

出典:
Stokes, G.G. (1851) On the Effect of the Internal Friction of Fluids on the Motion of Pendulums. Transactions of the Cambridge Philosophical Society, Part II, 9, 8-106.

次の文献に引用あり
https://www.researchgate.net/publication/265476815_Gravity_Surveying_in_Early_Geophysics_I_From_Time-Keeping_to_Figure_of_the_Earth