578 REPORT— 1901. 



The following- notes have been deduced from these observations: — 



(1) The crust of the earth is depressed under areas of high barometric pressure, 

 and elevated under areas of low pressure. 



(2) When the barometer is high over the Pacific slope from British Columbia 

 to California and low over the adjacent ocean, the horizontal pendulum is deflected 

 towards the east. 



(3) When the barometer is high ofif the coast and low over the Pacific slope, 

 the horizontal pendulum is deflected towards the west. 



(4) The horizontal pendulum tends to move east during the winter months and 

 west throughout the summer. 



(5) The total westerly movement (signifying a depression of the coast) ex- 

 ceeds the easterly swing for the year 1899 by 54" 9 millimetres and by 20' 7 for 

 1900. 



(6) When an extensive ocean storm area is approaching the coast of Van- 

 couver Island, while the barometer is high over the Pacific slope, the pendulum will 

 steadily travel eastward befoi-e the coast barometers begin to fall, or its presence 

 is noticeable upon the synoptic weather chart. 



(7) Should such a storm be followed by an extensive high pressure area, the 

 pendulum will turn and move steadily toward the westward, sometime before the 

 local barometer begins to rise and before the winds have shifted to the westward. 



(8) Should an important storm area move down the coast from Alaska and 

 be followed by an extensive one of high pressure and a cold wave extending from 

 the Yukon south-eastward, the pendulum swings to the westward, usually before the 

 storm has reached this latitude. These are termed abnormal winter movements, 

 and cause the few cold days experienced in this vicinity. 



(9) The greatest monthly range occurs during the stormy winter months, and 

 the smallest range takes place during the summer type of almost continuous fine 

 weather. 



(10) The diurnal range is most pronounced during the summer months, when 

 the greatest amount of sunshine is recorded, and the least amount of rain. 



(11) Fine weather is usually preceded by a westerly movement of the pendu- 

 lum, due to an approaching ocean high area which spreads inland over the province, 

 while further south the barometer is comparatively low. 



(12) A careful perusal of the two years' plottings proves that during the 

 normal type of summer and winter barometric distribution the barometer and 

 pendulum curves tend to come together as areas of low pressure approach the coast, 

 and diverge when high areas follow the same course. 



The above brief and incomplete summary of deductions derived from the^e two 

 3'ears' observations is respectfully submitted with a stroug desire that this investi- 

 gation be taken up by a special committee, and if this study of the pendulum's 

 warnings tends to aid the forecasting of ocean storms upon this distant seaboard of 

 the empire, may not a similar study at home lead to the adoption of simple 

 seismographs throughout the kingdom to be used as sensitive barometers, as an aid 

 in warning the advent of the great Atlantic storms before they reach the western 

 coast ? 



On Meteorological Phe^iomena in Relatio'n to Changes in the Vertical, 

 By Professor J. Milnk, F.K.S. 



WEDNESDAY, SEPTEMBER 18. 



The following Report and Papers were read : — 



1 , Report on the Determination of Magnetic Force on Board Ship. 



See Reports, p. 29. 



I 



