APPENDIX D LXIII 
In order that the seismological records obtained at our stations may 
be used to the best advantage, it is altogether necessary that they be 
discussed and compared with records obtained in other parts of the world, 
hence prints showing all the more important disturbances are sent to the 
Central Bureau of the Seismological Committee in England; to the 
International Seismological Commission in Strassburg and to Johns 
Hopkins Univesity at each of which places records from all parts of the 
world are tabulated and discussed by persons who devote their whole 
time to seismological investigation. à 
Magnetic Observatory. 
Absolute determirations of magnetic declination, dip and horizontal 
force to check the zero of the differential instruments are made at 
frequent intervals. Continuous records of the declination and the 
horizontal component have also been obtained end several important 
magnetic storms have been recorded, notably of February 9th, occurring 
at a time of great solar disturbance. 
In September, Mr. P. H. Dike acting under instructions from Dr. 
L. A. Bauer, Director of the branch of Terrestrial Magnetism of the 
Carnegie Institution brought instruments from the United States and 
made comparison between the results obtained at Agincourt and those 
obtained at Cheltenham, Maryland. Dr. Bauer in his report says:— 
“These comparisons have proven that the standard instruments of the 
two countries agree sufficiently closely for all practical purposes. Hence, 
instruments used in field work in Canada as referred to either set of 
standards will give results as comparable as need be for practical 
requirements. f 
U.S.C. & G.S. magnetometer No. 20 gave west declination on the 
average, 0’.16, higher than the Agincourt Observatory instrument 
whereas at Cheltenham it gave results on the average 1’.10 higher, or 
the apparent difference, Agincourt—Cheltenham, would be -+0’.94. 
However, the conclusive proof of the existence of this difference would . 
require a much more careful comparison than was possible under the 
circumstances; in the case of each observatory an investigation as to 
possibility of differences due to different piers or observing stations 
having been used would be necessary. Magnetometer No. 20 revealed 
certain, hitherto unsuspected irregularities, the cause of which has ‘not 
yet been disclosed. No correction for declination has thus far been 
applied to this instrument. The large Wild-Edelmann declinometer at 
the Cheltenham Magnetic Obesrvatory also occasionally reveals irregu- 
larities not yet satisfactorily accounted for. It is believed, therefore, 
