摘要:

AbstractThis paper describes the circumstances relating to the finding and identification of the aerolites that fell at Sylacauga, Alabama, one of which struck and injured a human being. The fall occurred on November 30, 1954, at about 1:00 P.M., CST, in the Sylacauga area, Talladega County, Alabama. Two aerolites have been recovered. The larger, weighing 8.5 pounds, pierced the roof of a dwelling and injured a sleeping occupant; the smaller, weighing 3.75 pounds, fell into an open area. The specimens of aerolite are irregular and angular in shape and are covered with a satiny, black coating. Most of the surfaces are plane, in some cases perpendicular to one another, with distinct, but well‐rounded edges. Certain surfaces are covered with thumb‐marks (piezoglyphs). One minor surface exhibits a remarkably regular series of parallel bands approximately one‐half inch wide, extending the full length of the face. No perceptible surface relief is associated with these bands, but only a variation in color from black to gray. Such a feature does not seem to have been noted heretofore in connection with meteo

ISSN:0026-1114    

DOI:10.1111/j.1945-5100.1954.tb01323.x

出版商:Blackwell Publishing Ltd    

年代:1954

数据来源: WILEY

摘要:

ABSTRACTExperiments have been carried out by using small‐caliber projectiles for the determination of projectile penetration into brittle porous media. An empirical law for projectile penetration has been derived from these experiments, in which a .30‐caliber flat‐nosed projectile was used on four different target media that had ranges in permeability from 6 × 10−8cm2to 39,000 × 10−8cm2and Rittinger's numbers that ranged from 6.5 cm2/kg‐cm to 2

ISSN:0026-1114    

DOI:10.1111/j.1945-5100.1954.tb01324.x

出版商:Blackwell Publishing Ltd    

年代:1954

数据来源: WILEY

摘要:

ABSTRACTThis paper presents a projective graphic method for reconstructing from field observations made by laymen the trajectory of a meteorite thru the atmosphere. Given sufficient data, the method quickly produces the geographic coördinates and the elevation above sea‐level of both the beginning and the end point of the trajectory, the curvatures of the path of the meteorite in both the vertical and the horizontal planes, the point of impact with the Earth, and the mean velocity of the meteorite. The solution can be carried out fully under field conditions, and produces results of an accuracy commensurate with the accuracy of the original observatio

ISSN:0026-1114    

DOI:10.1111/j.1945-5100.1954.tb01325.x

出版商:Blackwell Publishing Ltd    

年代:1954

数据来源: WILEY

摘要:

ABSTRACTThe essence of this paper is contained in 6 tables entitled: (1) the 5 groups of minerals and their members, some or all of which occur as essential meteoritic minerals; (2) the essential or Class I meteoritic minerals; (3) the primary accessory or Class II meteoritic minerals; (4) the secondary accessory or Class III meteoritic minerals (including both trace (t) and doubtful (d) minerals); (5) the subclasses of meteorites and their symbols (in the simplified classification of meteorites); and (6) the (2‐dimensional) classificational sequence of meteorites. These tables are described and discussed, and certain conclusions are drawn from them, especially from Table 6. An “Addendum on Certain Subclasses Not Mentioned in Table 5” is included between the main part of the paper and the “Notes and References” a

ISSN:0026-1114    

DOI:10.1111/j.1945-5100.1954.tb01326.x

出版商:Blackwell Publishing Ltd    

年代:1954

数据来源: WILEY

摘要:

ABSTRACTThe classificational distribution by weight of 1495 meteoritic falls of the world inventoried in the recent (1953: 2nd) edition of the Prior‐HeyCatalogue of Meteoritesis presented statistically in a table bearing that caption and graphically by means of 7 line diagrams. The system of classification used is the simplified classification of meteorites in its latest form. The integrated weight of the 1495 falls—which together constitute almost the entire known meteoritic increment of the Earth—is, in round numbers, between 450 and 500 metric

ISSN:0026-1114    

DOI:10.1111/j.1945-5100.1954.tb01327.x

出版商:Blackwell Publishing Ltd    

年代:1954

数据来源: WILEY

摘要:

ABSTRACTThis paper gives an account of the discovery and identification of the largest aerolite found to date in the State of New Mexico, namely, Chico, Colfax County (CN = 1042,365). The meteorite, which weighs 231 pounds, is a chondrite notable for the extraordinary size of some of the chondri that it contains. The largest of these bodies so far found is in shape approximately an ellipsoid of three unequal axes of dimensions 57 × 44 × 26 mm. Since the density of this metal‐rich chondrus is certainly in excess of the average density, S.5, determined for the whole meteorite, its weight exceeds 120 gm.,i.e., one‐fourth of a

ISSN:0026-1114    

DOI:10.1111/j.1945-5100.1954.tb01328.x

出版商:Blackwell Publishing Ltd    

年代:1954

数据来源: WILEY

摘要:

ABSTRACTA 344‐gm., nearly complete aerolite, found about 1936 February, in the vicinity of Marlow, Stephens County, Oklahoma (CN of the place of find = 0981,346), is described. The specimen is classifiedprovisionallyas an enstatite‐olivine chondrite (symbol = Co

ISSN:0026-1114    

DOI:10.1111/j.1945-5100.1954.tb01329.x

出版商:Blackwell Publishing Ltd    

年代:1954

数据来源: WILEY

摘要:

ABSTRACTArguments are advanced for accepting as valid the measurements, descriptions, and conclusions published in 1924 concerning the giant Adrar (= Chinguetti) meteorite, the very existence of which has long been a point at issue among scientists. Since any criticism of Adrar certainly should be based on the original data gathered by Ripert and presented by Lacroix, a translation of the latter's initial publication on the Adrar meteorite is included in the present paper (as part 2). This translation provides supporting evidence for many of the statements made in the critical commentary in part I. Not only because the original data published on the Adrar meteorite were so factually presented and so internally consistent, but also because all objections to its huge size that have appeared since the publication of Lacroix's paper have been shown to be quite without foundation, relocation of this exceptional meteorite would constitute an undertaking, the successful consummation of which would be of the greatest importance to meteoritics.

ISSN:0026-1114    

DOI:10.1111/j.1945-5100.1954.tb01330.x

出版商:Blackwell Publishing Ltd    

年代:1954

数据来源: WILEY

摘要:

ABSTRACTThis paper gives a brief preliminary report on an expedition to the Wolf Creek Crater, which recovered in excess of 1400 pounds of more‐or‐less completely oxidized meteoritic material, including 3 large, unusually dense, masses weighing 352, 336, and 324 pounds, respectively. Each of these big masses exceeds by nearly 100 times the largest specimens heretofore found at the Wolf Creek Crater. The smaller, less dense, specimens recovered appear to be much like the so‐called “shale balls” found at the Barringer and Odessa Meteorite Craters. Photographs and descriptions of typical specimens and of the southwestern slope of the Wolf Creek Crater, on which the finds were made, are included in

ISSN:0026-1114    

DOI:10.1111/j.1945-5100.1954.tb01331.x

出版商:Blackwell Publishing Ltd    

年代:1954

数据来源: WILEY

摘要:

ABSTRACTThis paper contains a preliminary description of the surface features and physical characteristics of two of the three largest masses of meteoritic material so far recovered at the Wolf Creek Crater. An account is given also of the remarkably complex internal structure revealed by slicing the specimens in question.

ISSN:0026-1114    

DOI:10.1111/j.1945-5100.1954.tb01332.x

出版商:Blackwell Publishing Ltd    

年代:1954

数据来源: WILEY