Meteoric astronomy: A treatise on shooting-stars, fire-balls, and aerolites — John Shaqi
Meteoric astronomy: A treatise on shooting-stars, fire-balls, and aerolitesKirkwood, Daniel
Science
Meteoric astronomy: A treatise on shooting-stars, fire-balls, and aerolites
Kirkwood, Daniel
Meteors
3. On the 14th of July, 1845, a brilliant meteor was seen in London.
4. On the 13th of July, 1846, at about 9h. and 30m. P.M., a brilliant
fire-ball passed over Maryland and Pennsylvania, and was seen also in
Virginia, Delaware, New Jersey, New York, and Connecticut. Its course
was north, about thirty degrees east, and the projection of its path
on the earth's surface passed about four miles west of Lancaster,
Pennsylvania, and nearly through Mauch Chunk, in Carbon County. When
west of Philadelphia its angle of elevation, as seen from that city,
was forty-two degrees. Consequently its altitude, when near Lancaster,
was about fifty-nine miles. The projection of its visible path, on the
earth's surface, was at least two hundred and fifty miles in length.
Its height, when nearest Gettysburg, was about seventy miles, and it
disappeared at an elevation of about eighteen miles, near the south
corner of Wayne County, Pennsylvania. Its apparent diameter, as seen
from York and Lancaster, was about half that of the moon, and its
estimated heliocentric velocity was between twenty and twenty-five
miles.
The author was assured by persons in Harford County, Maryland, and also
in York, Pennsylvania, that shortly after the disappearance of the
meteor a distinct report, like that of a distant cannon, was heard.
As might be expected, their estimates of the interval which elapsed
were different; but Daniel M. Ettinger, Esq., of York, who was paying
particular attention, in expectation of a report, stated that it was
a little over six minutes. This would indicate a distance of about
seventy-five miles. The sound could not therefore have resulted from
an explosion at or near the termination of the meteor's observed path.
The inclination of the meteoric track to the surface of the earth
was such that the body could not have passed out of the atmosphere.
As no aerolites, however, were found beneath any part of its path,
perhaps the entire mass may have been dissipated before reaching the
earth.--_Silliman's Journal_ for May, 1866.
5. On the 14th of July, 1847, a remarkable fall of aerolites was
witnessed at Braunau, in Bohemia. Humboldt states that "the fallen
masses of stone were so hot, that, after six hours, they could not be
touched without causing a burn." An analysis of some of the fragments,
by Fischer and Duflos, gave the following result:
Iron 91·862
Nickel 5·517
Cobalt 0·529
Copper, manganese, arsenic, calcium, magnesium,
silicium, carbon, chlorine and sulphur. 2·072
-------
100·000
6. On the 13th of July, 1848, a brilliant fire-ball was seen at
Stone-Easton, Somerset, England.
7. On the 13th of July, 1852, a large bolide was seen in London.
Public-domain text, read in full here on John Shaqi.
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