The Trouvelot astronomical drawings manualTrouvelot, E. L. (Etienne Leopold)
Science
The Trouvelot astronomical drawings manual
Trouvelot, E. L. (Etienne Leopold)
Astronomy -- Pictorial works
While some moved either in wavy or zig-zag lines, strongly accentuated,
others, after moving for a time in a straight line, gradually changed
their course, curving upward or downward, thus moving in a new
direction. Several among them, which were apparently moving in a
straight line with great rapidity, suddenly altered their course,
starting at an abrupt angle in another direction, with no apparent
slackening in their motion. One of them, which was a very conspicuous
object, was moving slowly in a straight course, when of a sudden it made
a sharp turn and continued to travel in a straight line, at an acute
angle with the first, retreating, and almost going back towards the
regions from which it originally came. As nearly all the meteors which
exhibited these extraordinary motions left the trace of their passage in
the sky by a luminous trail, it was easily ascertained that these
appearances were not deceptive. On one occasion I noticed that the
change of direction in the orbit corresponded with the brightening up of
the meteor thus disturbed in its progress.
Among these meteors, some traveled very slowly, and a few seemed to
advance as if by jerks, but in general they moved very rapidly. One of
the meteors thus appearing to move by jerks left a luminous trail, upon
which the various jerks seemed to be left impressed by a succession of
bright and faint spaces along the train. Some of the largest meteors
appeared to rotate upon an axis as they advanced, and most of these
revolving meteors, as also a great number of the others, seemed to
explode just before they disappeared, sending bright fiery sparks of
different colors in all directions, although no sound was at any time
heard. The largest and most brilliant meteor observed on that night
appeared at 5h. 30m., a little before sunrise. It was very bright, and
appeared considerably larger than Venus, having quite a distinct disk.
This meteor moved very slowly, leaving behind a large phosphorescent
trail, which seemed to issue from the inside of the nucleus as it
advanced. For a moment the train increased in size and brightness close
to the nucleus, which then appeared as an empty transparent sphere,
sprinkled all over with minute fiery sparks; the nucleus then suddenly
burst out into luminous particles, which immediately vanished, only the
luminous trail of considerable dimensions being left.
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