14. —— "Sulla velocità di propagazione e sulla lunghezza delle onde sismiche." Ital. Soc. Sismol. Boll., vol. i., 1895, pp. 52-60—especially pp. 52-57.
15. —— "Sull' intensità e sull' ampiezza del movimento nel gran terremoto giapponese del 28 ottobre 1891." Ital. Soc. Sismol. Boll., vol. ii., 1896, pp. 189-200.
16. —— "Note on the After-shocks of the Mino-Owari Earthquake of Oct. 28th, 1891." Pub. Earthquakes Inves. Com. in Foreign Languages, No. 7, Tokio, 1902, pp. 27-32.
17. —— "Note on the relation between Earthquake Frequency and the Atmospheric Pressure." Tokyo Phys.-Math. Soc. Reports, vol. ii., 1904, No. 8.
18. Tanakadate, A., and H. Nagaoka. "The Disturbance of Isomagnetics attending the Mino-Owari Earthquake of 1891." Journ. Coll. Sci. Imp. Univ. Japan, vol. v., 1893, pp. 149-192.
FOOTNOTES:
[54] I have not referred to the results of this survey, for, though changes in all the magnetic elements (especially in horizontal intensity) have taken place between 1887 and 1891-92, these changes cannot be ascribed with confidence to the earthquake in the absence of a thorough knowledge of the secular variation.
[55] From the formula a = xg / y, where a is the maximum horizontal acceleration, g the acceleration due to gravity, y the height of the centre of gravity, and x its horizontal distance from the edge about which the body was overturned.
[56] These estimates are made, on the supposition of simple harmonic motion, from the formula 2a = αt² / (2π²), where 2a is the total range or double amplitude, a the maximum acceleration, and t the period of the vibration.