APPENDIX B LXXVII 
The time service has been maintained as in previous years; 
this includes, on the one hand, the operation of the electrical clocks 
in the Government buildings, the maintenance of relays beating 
seconds in several offices in the city, and the sending out of time 
signals by telegraph and telephone; on the other the various incidental 
requirements of the Observatory, such as operation of chronographs, 
recording of time on the seismographs, rating of watches and chron- 
ometers, etc. The dropping of the time-ball has been discontinued 
for the present, since the fire in the Parliament building. 
The astronomical field work consisted of the determination of 
latitude and longitude at thirteen points. Of these one was a Lapla- 
cian point, to be used in the adjustment of a portion of the geodetic 
net; at this station, which was in eastern Quebec, the azimuth of one 
of the lines of the triangulation was also measured. The establish- 
ment of such Laplacian points, involving determination at the same 
point of longitude, latitude, and azimuth will be required at various 
stations as a means of eliminating certain cumulative errors in the 
geodetic triangulation. 
Of the remaining stations the longitudes of three northern, 
Ontario, along the National Transcontinental railway, were deter- 
mined by electric telegraph from Ottawa. The remaining nine, seven 
in Quebec and two in Ontario, near Georgian bay, were determined 
by wireless telegraphy in the manner described in last year’s report. 
The latitudes of all these stations were also determined. 
(GEOPHYSICS 
During the past year the instruments for the study of the defor- 
mation of the earth under the influence of the moon and sun, an 
international undertaking, have been set up in the specially constructed 
vault, and continuous photographic records have been obtained. 
The seismographic instruments have been in constant operation 
during the year and 81 earthquakes were recorded. Seismological 
tables were issued and distributed amongst practically all the seis- 
mological stations of the world. As these are the first complete 
tables issued they will tend towards uniformity in interpretation of 
seismograms. The monthly bulletins of recorded earthquakes have 
been continued as heretofore. The undagraph at Chebucto, near 
Halifax, has been in operation during the year and recorded the waves 
of the Atlantic reaching Chebucto, for correlation with the micro- 
seismic record at the Observatory. 
The magnetic survey of Canada has progressed satisfactorily. 
During the season 48 new stations were occupied, at each of which 
the three magnetic elements, declination, inclination, and intensity 
