摘要:

ABSTRACTOne of the unsettled questions in meteoritics relates to the determination of the total number,N, of meteorites falling in such showers as those of Pultusk (Poland), Estherville (Iowa), and Holbrook (Arizona). The value ofNhas, for obvious reasons, not been determined by counting. Partial and unsystematic counts either have been accepted as giving the true value ofNor else have been corrected by arbitrarily assuming that some specified fraction ofNescaped enumeration. In the present paper, several simple criteria for estimating the population of a meteoritic shower are derived by use of the theory of probability. The formulas deduced for the determination ofNhave been tested with satisfactory results on man‐made meteoritic showers. By the use of one of the criteria, it is shown that, for the Holbrook shower,Nwas almost certainly of the order of 100,000, and hence that the population of the Pultusk shower, which seems to have been a larger one even than Holbrook, probably considerably exceeded this figure. The criteria developed may be employed in many other connection

ISSN:0096-2813    

DOI:10.1111/j.1945-5100.1941.tb00267.x

出版商:Blackwell Publishing Ltd    

年代:1941

数据来源: WILEY

ISSN:0096-2813    

DOI:10.1111/j.1945-5100.1941.tb00268.x

出版商:Blackwell Publishing Ltd    

年代:1941

数据来源: WILEY

摘要:

ABSTRACTCraters presenting unmistakable evidence of an impact origin have been excluded from the category of meteorite craters because no meteoritic materials have been found in or near them. The origin of certain silica‐glass deposits (closely resembling the glasses produced by fusion of siliceous materials in the intense heat incident to meteoritic impact with the surface of the Earth) is regarded as a mystery, because meteorites have not been found associated with these deposits. Attention is called in this communication to the possibility of the existence ofcontraterrene meteorites(defined in the paper), which would be just as capable of producing meteorite craters and silica‐glass as are ordinary meteorites, but of which no trace would remain after collision with the Ea

ISSN:0096-2813    

DOI:10.1111/j.1945-5100.1941.tb00269.x

出版商:Blackwell Publishing Ltd    

年代:1941

数据来源: WILEY

摘要:

ABSTRACTA newspaper account of a mysterious explosion at sea is reviewed and shown to be not inconsistent with the supposition that the explosion may have been due to the fall of a contraterrene meteorite. Attention of astronomers and meteoriticists is called to this and other types of phenomena which they may have to investigate in the light of the hypothesis of the existence of contraterrene matter.

ISSN:0096-2813    

DOI:10.1111/j.1945-5100.1941.tb00270.x

出版商:Blackwell Publishing Ltd    

年代:1941

数据来源: WILEY

ISSN:0096-2813    

DOI:10.1111/j.1945-5100.1941.tb00271.x

出版商:Blackwell Publishing Ltd    

年代:1941

数据来源: WILEY

摘要:

ABSTRACTThis paper contains 3 tables of statistics, as of date 1941 January 1, for the meteoritic falls of (1) the United States, (2) countries other than the United States, and (3) the continents and the world (1392 falls in all) and a brief discussion of the contents of each table. The data for the tables have been taken from a manuscript catalog of the meteoritic falls of the world now in process of compilation by the writers. The paper ends with a consideration of some 15 factors that favor the recovery of meteorites.

ISSN:0096-2813    

DOI:10.1111/j.1945-5100.1941.tb00272.x

出版商:Blackwell Publishing Ltd    

年代:1941

数据来源: WILEY

摘要:

ABSTRACTThe importance of the showering of small particles associated with meteoritic falls is emphasized and some of the difficulties encountered by those who attempt to investigate the phenomenon are pointed out. A trial search for specimens at the site of the Holbrook, Arizona, fall of 1912 July 19, made in April, 1940, is described. 3 small aërolites with a combined weight of 0.0948 g., which were recovered in the course of the search, are recorded. The method of collecting specimens is described and a plan for obtaining a quantitative estimate of the total amount of material that fell in this shower is outlined

ISSN:0096-2813    

DOI:10.1111/j.1945-5100.1941.tb00273.x

出版商:Blackwell Publishing Ltd    

年代:1941

数据来源: WILEY

ISSN:0096-2813    

DOI:10.1111/j.1945-5100.1941.tb00274.x

出版商:Blackwell Publishing Ltd    

年代:1941

数据来源: WILEY

摘要:

ABSTRACTThis paper is a continuation of the related article inC.S.R.M. for March, 1941. It consists mainly of 3 tables exhibiting the areal concentration of the meteoritic falls of (1) the United States, (2) countries other than the United States, and (3) the continents and the world (1388 falls in all) and a short discussion of the material in each table. Many of the conclusions reached in the present study are in striking contrast to, though they are of course quite in harmony with, those set forth in the earlier paper.Density of populationis seen clearly to be a reason for theconcentrationof known meteoritic falls, while a sixteenth point favoring the recovery of meteorites is recognized and stated.

ISSN:0096-2813    

DOI:10.1111/j.1945-5100.1941.tb00275.x

出版商:Blackwell Publishing Ltd    

年代:1941

数据来源: WILEY

ISSN:0096-2813    

DOI:10.1111/j.1945-5100.1941.tb00276.x

出版商:Blackwell Publishing Ltd    

年代:1941

数据来源: WILEY