Earthquakes and other earth movements earthquakesother00miln Year: 1886 EARTHQUAKE MOTION DEDUCED FROM EXPERIMENT. 63 these experiments tremors were observed as preceding and following the main shock. Abbofs Results,—The important results obtained bj General Abbot are contained in the following table :— § S^ ^^ a •^•-d 0) '^ to o g >,?i'^ • > Date Cause of Shock g§3 ai 41. !^ 53 .11 s b| § pec ^ > 1 Aug. 18, 1876 200 lbs. of dynamite 5 ± B 5,280 2 Sept. 24,1876 Hallet's Point Explosion A 3,873 3 »> »> »> » 8-330 B 8,800 4 »> »> j> » A 4,521 5 „ ?» >
Earthquakes and other earth movements earthquakesother00miln Year: 1886 EARTHQUAKE MOTION DEDUCED FROM EXPERIMENT. 63 these experiments tremors were observed as preceding and following the main shock. Abbofs Results,—The important results obtained bj General Abbot are contained in the following table :— § S^ ^^ a •^•-d 0) '^ to o g >,?i'^ • > Date Cause of Shock g§3 ai 41. !^ 53 .11 s b| § pec ^ > 1 Aug. 18, 1876 200 lbs. of dynamite 5 ± B 5,280 2 Sept. 24,1876 Hallet's Point Explosion A 3,873 3 »> »> »> » 8-330 B 8,800 4 »> »> j> » A 4,521 5 „ ?» >» V 12-769 B 5,309 6 Oct. 10, 1876 70 lbs. dynamite 1-360 A 1,240 7 Sept. 6, 1877 400 „ 1-169 A 3,428 8 J, »i >» »» M69 B 8,814 9 Sept. 12, 1877 200 „ 1-340 A 6,730 10 >» ' »» »» 1-340 B 8,730 11 70 „ 1-340 A 6,559 12 ' )» »> »» 1-340 B 8,415 A seismometer of type A means that the telescope used in observing the tremor produced on the surface of a vessel of mercury by the passage of the shock had a magnification of 6, whilst a telescope of the type B had a magnification of 12. The mean velocity given by six observations with type A is 4,225 feet per second, while that given by the same number with type B is 7,475 feet per second. If we assume that the first tremor observed in the mercury is to determine the true rate of transmission, Greneral Abbot tells us that we must reject all observations made with type A, inasmuch as they do not reveal the velocity of the leading tremor. However, he also tells
Size: 1797px × 1113px
Photo credit: © Bookend / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: archive, book, drawing, historical, history, illustration, image, page, picture, print, reference, vintage
