﻿107 



1902. 



The bright glow had quite disiippe.ircd at 4h. 37ni. a.m., and at 4h. 39m. a.m. a .similar arc 

 in position, amplitude and altitude had formed. 



6h. a.m. Arched band of streamers radiating towards zenith, extending irregularly and 

 interruptedly from over Mount Discovery, Observation Hill (3° above it). Crater Hill, and over 

 Harbour Hill to N.N.E. magnetic. The streamers were most brilliant and strongest in the S. 

 magnetic. A little W. of Observation Hill, where they seemed to eclipse stars of 4th magnitude, 

 these streamers appeared, with slight variations, to be fairly constant. 



8h. a.m. The right half of an arc formed of vertical lieams. Started from the horizon at 

 E.N.E. and N.E. (magnetic) and rising to 15° or 20° over Observation Hill at N.N.W. magnetic, 

 was lost at about 20° over N.W. magnetic, where there were the only beams of any length 

 (viz., about 10°). Intensity faint. Light N.E. airs. - 6° F. No clouds, very clear. 



7h. 20m. a.m. Nothing of the arc described al)ove was visible, but there were two patches of 

 faint vertical streamers over N.W. (magnetic), which started at an altitude of 40° and rose to 

 50° and 60°. Beyond these there was no glow or arc. Meteorological conditions same as 

 at 8h. a.m. 



Time, noon. Very faint auroral beam across zenith from E. to W. (magnetic), faint on 

 account of twilight. - 9° F. Wind E., 2. No clouds. 



July 5. — (Plates 9 and 10.) At Oh. 30m. a.m., broad and rather brilliant double arc, extending from 

 S.S.E. to S. (true), altitude 10° to 70°, with a distending curtain above, altitude 45°, varying 

 quickly in brilliancy. Auroral glare in the E. and S.E. true. 



From Oh. 52m. a.m. to Ih. 7m. a.m., observed aurora as follows ; — Dull, luminous arc 

 from N.N.E. to W. (magnetic), altitude (apex over Observation Hill) 18°, almost stationary 

 and little variation in the intensity of the light. A great mass of irregular aurora clouds, 

 comparatively bright, stretching up from S.W. by S. (magnetic), across zenith, forming light 

 luminous patches here and there in its course. All stars plainly visible through the clouds. 

 With Metz direct-vision spectroscope the line in yellow-green part of spectrum visible, but very 

 faintly, and impossible to measure its position. Large prismatic camera set up, plate exposed, 

 and instrument directed to brightest patches. [On subsequent development, nothing appeared 

 on the plate, although it was exposed for at least 8 hours. Many plates have already been 

 exposed, but without the slightest result. The spectrum plates used (Cadet's) are apparently in 

 good condition, and good photographs have been procured of all the lines of krypton gas and the 

 pure spectrum from end to end of a bright-biuning oil lamp.] Temperature, - 10° F. Light 

 N.E. airs, no clouds. 



At Ih. 7m. a.m. nearly whole of eastern sky (W. magnetic) was lit up with faint aurora 

 clouds which crossed zenith and stopped 5° W. of zenith. 



Fairly brilliant display from Ih. 7m. a.m. to Ih. 57ni. a.m. (true), principally in S. (magnetic) 

 in form of two radiating streamers. 



At Ih. 47m. a.m. to Ih. 52m. a.m. very beautiful folding curtain rising from hill in S. 

 (magnetic) to an altitude of 30° in S. 15° E. (magnetic). With spectroscope characteristic line 

 near D visible, but too faint to measure. The aurora clouds seemed to drift before the wind and 

 ultimately reached to within 45° of W. horizon (true). 



From Ih. 15m. to 2h. Om. a.m. the auroral display in N. (true) was very fine and at 

 times of a greenish tint, with portions of arcs radiating from N. to W.N.W. (true), maximum 

 altitude 45°, and to N.E., maximum altitude 45°, and one from N.E. to S.E. (true), about 30°. 

 The arc from N. to W.N.W. quickly changed from a glow to patches of streamers, which again 

 changed to a curtain, and then to a series of curtains travelling up towards the zenith and W. 

 As these faded, a spiral curtain brightened up from the same N. point, reaching about 30° in 

 altitude, with very bright base, the curtain being of a green-yellowish tint, with very faint pink 

 hue at the base. This spiral gradually transformed into a series of streamers, and subsequently 

 diffused into a glow. At the same time there was an arc of streamers in the S.E. true, and a 



P 2 



