234 



REroKT — 1898. 



It will be observed that these records, unlike those in the next i-egister 

 for Utrecht, do not refer to 'burr '-like markings produced at the time 

 of earthquakes, but to magnetic movements which have had a considerable 

 duration, and which commenced some hours before the occurrence of the 

 earthquakes to which they are in juxtaposition. 



For fourteen earthquakes it will be noticed that there is no corre- 

 sponding magnetic disturbance, but, singularly enough, at least ten of 

 these earthquakes were small, originating, for example, in Italy, the 

 mechanical movements accompanying which were not recordable even at 

 so short a distance as England. Appai'ently, therefore, the greater 

 number of perturbations recorded at Greenwich have only preceded 

 very large eai'thquakes representing internal adjustments of the earth's 

 crust. Something analogous to this will be found in the Zikawei 

 register, p. 245. 



Magnetometer Disturbances recorded at the Moyul Meteorological Institute of the 

 Netherlands, Utrecht. Director, Dr. M. Snellen. 



No. 



1 No. on 

 I List 

 ! p. 227 



Month Day 



Time of 

 Eax'tliquake 



Magnetometer Disturbances 



1889. 



VII. 



11 



H. M. 



10 22 P.M. 



D lOh. 42m. mas. at lOh. 50m.. and 

 llh. Im. H lOh. 39m.. with max. 

 at lOh. 41m., lOh. 52m., llli. 2m., and 

 13h. 20m. 



1891. 



9 

 10 



X. 



IV. 

 V. 



27 



19 

 12 



9 38 P.M. 



D 9h. Om. Ss. ; 9h. 28m. ; 9h. 44m. 50s. ; 

 lOh. 2m. ; lOh. 8m. ; lOh. 32in. H. =0. 



1892. 



8 

 9 



10 

 11 



12 

 13 

 14 



15 



16 

 17 

 18 

 19 

 20 



11 80 a.m. 

 5 43 A.M. 



18 



11 46 P.M. 



O 4 P.M. 



D and H llh. 33m. 

 D and H 7h. 14m. ? 



93. 



D 



11 6 



8 43 

 1 51 



1 32 



9 58 



1 3 

 8 38 

 1 43 



P.M. 

 P.M. 

 P.M. 



P.M. 

 A.M. 



A.M. 

 P.M. 

 A.M. 



9h. 24m.; lOh. Om. ; llh. 2m. H 



9h. 26m.; lOh. Om. 

 D lOh. 46m.; llh. 34m.; llh. 5Cm. 



H lOh. 48m.; llh. 24m.; 12h 4m. 

 D llh. 56m. H llh. 56m. 

 D 81i. 54m. H not registering 

 D Ih. 42m.; Ih. 56m. Hlh. 40m. ; 



Ih. 57m. 

 D 2h. 40m. 

 D 9h. olm 



9h. 5Sm. 

 D Ih. l!)m. 

 D 7h. 36m. 

 Auff. 1,D llh. 20m. r 



H llh. 36m. P.M. 



11 2h. 40m. 

 9h. 58m. 



11= 0. 

 H 8h. 20m. 

 M. ; 



H 9h. 51m.; 



llh. 36m. P.M. 



1894. 



10 37 A.M. 



7 55 P.M. 



10 30 A.M. 

 9 A.M. 

 9 8 P.M. 



D lOh. 27m. ; 19h. 26m., &c. H lOh. 



27m.; llh. 21m., kc. 

 D 7h. 57m. H 7h. 57m. 

 Not registering: 



D lOh. 28m. H lOh. Im. ; lOh. 32m. 

 D 7h. 51m. H 9h. Om. 

 D 9h. Om. ; H 91i. 8m. 



