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Page:Popular Science Monthly Volume 18.djvu/196

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184
THE POPULAR SCIENCE MONTHLY.

horizon soon after dark, and a person who persistently watches it during the night will find, with increasing elevation of the radiant, a corresponding increase in the hourly number of meteors. In 1877, at Bristol, the eastern sky was persistently watched between 9h. 30m. and 14h. 30m., when 354 meteors were seen; and, though the horary

PSM V18 D196 Radiant points east of the perseids aug 6 to 13.jpg

Fig. 3.—Radiant Points east of the Perseids, August 6th-13th.


PSM V18 D196 Showers and perseids.jpg
Major Showers. Minor Showers. Perseids.

rate before llh. was only 47, it rose to about 80 during the last half of the watch. Indeed, the number of meteors observed at the end of the watch was more than double the number recorded at the beginning of it. Thus it is apparent that the most favorable time for such observations is in the morning hours, and though it is generally inconvenient for amateurs to extend their vigils thus far, the importance of doing so can not be too strongly insisted on.