228 SCIENTIFIC RECORD FOR 1884. 



whose other end was attached to a stylus markiug upon a moving 

 drum; or {b) by making electrical contact in some one of a number of 

 circuits arranged radially about the normal position of the pendulum, and 

 thereby causing some one of a series of styles to record on a moving 

 drum; or, for strong shocks, (c) by the pendulum turning the whole re- 

 cording apparatus into the azimuth of its motion. Another device em- 

 ployed as a steady point a disk of lead between parallel glass plates and 

 resting on spheres of glass or ivory. 



For measuring the vertieal component he proposed to use the changes 

 in the rate of a falling body during the phases of the earth wave, these 

 changes being recorded by appropriate apparatus on a moving drum. 

 These suggestions were later commented on by J. A. Ewing [Nature, 

 XXXI, 4), who justly criticised the want of novelty of some of them and 

 the mechanical difficulties involved in others. 



BIBLIOGRAPHY. 



Books and separate reprints. 



(1) S. E. Bishop. — The equatorial smoke stream from Krakatoa. 32rao. 16 pp., 



1 pi. Honolulu, 1884. 



(2) Bulletino del vnlcanismo italiano. Anuo x, 1883. Roma, 1884. 



(3) Herm. Credner. — Die erzgebirgiscb vogtlandischeu ErdbeCen wiihrend der 



Jahre 1878 bis Anfang 1884. [Zeitscbr. f. Naturw., Halle a. S. (1884), 

 LVii, 1-29. Abstract : Neu. Jabrb. f. Min., Geol. u. Pal. (1885), i, 60.] 



(4) J. Delauney. — Lois des grands tremblements de terre et lenr provision. 



8 vo. 1 broch. Paris, 1884. 



(5) DiENER. — Das Erdbeben auf der Insel Ischia am 28. Juli 1883. [Mittheil. d. 



geogr. Gesellsch. Wien, 1884.] 

 (G) J. A. Ewing. — Earthquake measurement. Memoir No. 9, Sci. Dept. Univ. of Tokio. 

 4to. 12 + 92 pp., 24 pi. Tokio, 1883. 



(7) A. FoRSTER. — Das Erdbeben der schweizerischen Hochebene vom 27. Januar 1881. 



4to. 29 pp. Berne, 1883 (?). 



(8) C. W. C. FucHS.— Die vulkanischen Ereignisse des Jahres 1882. (18. Jahresbe- 



richt.) [Miner, u. petrog. Mittheil. (1883), 339-381.] 



(9) C. W. C. FucHS. — Die vulkanischen Ereignisse des Jahres 1883. ( 19. Jahresbe- 



richt.) [Miner, u. petrog. Mittheil. (1884), 185-231.] 



(10) L. Gatta. — Vnlcanismo. 16mo. 8 + 267 pp., map. Milano, 1885. 



(11) J. Henriet. — M^moire sur les tremblements de terre de Pile de Chio. 8vo. 24, 



pp. Marseille, 1884. 



(12) E. HusSAiv. — Ueber den Cordierit in vulkanischen Auswiirflingen. [Sitzber. k. 



Akad. Wiss. Wien, No. 9, 1883.] 



(13) H. J. Johnston-Lavis. — Notices on the earthquakes of Ischia of 1881 and 1883. 



8vo. Map. Naples, 1883. 



(14) KUNISCH. — Das schlesisch-bohmische Erdbeben vom 31. Jan. 1883. [Reprint 



from (?).] 



(15) J. P. O'Reilly. — Catalogue of the earthquakes having occurred in Great Brit- 



ain and Ireland during historical times; arranged relatively to localities and 

 frequency of occurrence, to serve as a basis for an earthquake map of the 

 three kingdoms. (Map.) [Trans. Roy. Ir. Acad. (Science), xxviii, 285-316.] 



(16) A. Sauer.— Die Krakatoa-Aschen des Jahres 1883. [Bericht. d. naturf. Gesellsch. 



zu Leipzig, 1883. Chem. Centralblatt, 1884, No. 8.] 



