EARTHQUAKE Records by THE MILNE SEISMOGRAPH TORONTO SIR FREDERIC STUPART, DIRECTOR. Preliminary Tremors. S. Secondary Waves. L.W. = P.T. = Large Waves. A.C. = Air Currents. Time is Greenwich Civil Mean Time, o or 24 h = midnight. 5th. Heavy micros, masked earthquake registered at other stations. Boom period 18 seconds. Pillar inclination Imm. o" 45. MAGNETIC OBSERVATIONS DECEMBER, 1918 During the month of December the Magnetic Forces, as recorded at Agincourt and Meanook, were generally very little disturbed. The period of greatest disturbance was from the afternoon of the 7th until the 10th. Rapid variations of both H and D of fairly large amplitudes occurred during the night of the 7th and again with lessened amplitudes during the nights of the 8th and 9th. In the Z the movements were slow but progressive and the departures from normal were quite large. On the 25th a moderately active disturbance was recorded at Agincourt continuing all day. At Meanook in D, this disturbance was particularly active from 6h. to 12h. 105th M.T. Sunspots as recorded in Toronto were not nearly so numerous as in preceding months, yet on all days on which observations were made there were some to be seen. There was also a marked diminution in the number of reports of the aurora by Meteorological observers. On the 7th and 8th however the aurora was observed in all parts of Canada and on the 24th and 25th in the Prairies Provinces only. No reports of aurora were made on the 15th, 19th and 28th and on the remaining days only from one to three observers report having seen it. |