![]() ![]() It differs from the Henry System in that periods are used to separate the generations and no changes in numbering are needed for families with more than nine children. It can be organized either by generation or not. The d'Aboville System is a descending numbering method developed by Jacques d'Aboville in 1940 that is very similar to the Henry System, widely used in France. In the Modified Henry System, when there are more than nine children, numbers greater than nine are placed in parentheses.ġ111. In the Henry System, when there are more than nine children, X is used for the 10th child, A is used for the 11th child, B is used for the 12th child, and so on. For example, 621 is the first child of 62, who is the second child of 6, who is the sixth child of his parents. The system allows one to derive an ancestor's relationship based on their number. The oldest child of 11 is 111, the next 112, and so on. The oldest child becomes 11, the next child is 12, and so on. The Henry System is a descending system created by Reginald Buchanan Henry for a genealogy of the families of the presidents of the United States that he wrote in 1935. Other differences between the two systems are mostly stylistic. The most significant difference between the NGSQ and the Register Systems is in the method of numbering for children who are not carried forward into future generations: The NGSQ System assigns a number to every child, whether or not that child is known to have progeny, and the Register System does not. It is sometimes called the "Record System" or the "Modified Register System" because it derives from the Register System. The NGSQ System gets its name from the National Genealogical Society Quarterly published by the National Genealogical Society headquartered in Falls Church, Virginia, which uses the method in its articles. (The other being the NGSQ System.) (– Generation One–) Register Style, of which the numbering system is part, is one of two major styles used in the U.S. The system was created in 1870 for use in the New England Historical and Genealogical Register published by the New England Historic Genealogical Society based in Boston, Massachusetts. The system is organized by generation, i.e., generations are grouped separately. The Register System uses both common numerals (1, 2, 3, 4) and Roman numerals (i, ii, iii, iv). Descending numbering systems Register System In general, numbers are assigned only to the primary individual studied in each generation. This method is most popular in simplified single surname studies, however, allied surnames of major family branches may be carried back as well. The siblings of the individual or individuals studied may or may not be named for each family. Genealogical writers sometimes choose to present ancestral lines by carrying back individuals with their spouses or single families generation by generation. The first 15 codes in each system, identifying individuals in four generations, are as follows: An advantage of this system is easier understanding of the genealogical path. For example 5 becomes 101 and then FMF (or MMF if the subject is male). The first character of each code (shown as X in the table below) is M if the subject is male and F if the subject is female. The atree or Binary Ahnentafel method is based on the same numbering of nodes, but first converts the numbers to binary notation and then converts each 0 to M (for Male) and each 1 to F (for Female). Hence, 08-146 is the subject's father's father's mother's father's father's mother's father. This ancestor was the father of a woman (146/2=73) (in the genealogical line of the subject), who was the mother of a man (73/2=36.5), further down the line the father of a man (36/2=18), father of a woman (18/2=9), mother of a man (9/2=4.5), father of the subject's father (4/2=2). 08-146, is a male preceding the subject by 7 (8-1) generations. This method's usefulness becomes apparent when applied further back in the generations: e.g. In order to readily have the generation stated for a certain person, the Ahnentafel numbering may be preceded by the generation. ![]() For instance, if John Smith is 10, his father is 20, and his mother is 21. The number of a person's father is twice their own number, and the number of a person's mother is twice their own, plus one. This system allows one to derive an ancestor's number without compiling the complete list, and allows one to derive an ancestor's relationship based on their number. Ahnentafel, also known as the Eytzinger Method, Sosa Method, and Sosa-Stradonitz Method, allows for the numbering of ancestors beginning with a descendant. ![]()
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