July 1, 1876: The Dewey Decimal System

July 1, 1876: The publication Library Journal publishes its 1st issue, in Boston. It is founded and largely written by Melvil Dewey, a 25-year-old librarian originally from Adams Center, New York, on Lake Ontario. In this issue, Dewey explained his new cataloguing system for library books, which has come to be known as the Dewey Decimal System.

Dewey was also a believer in the metric system, as it was also a base-ten system. But that's never caught on in America.

Dewey, identifying himself as "the author," explained his system as follows, with my editing:

The plan of the following Classification and Index was developed early in 1873. It was the result of several months' study of library economy as found in some hundreds of books and pamphlets, and in over fifty personal visits to various American libraries.

In this study, the author became convinced that the usefulness of these libraries might be greatly increased without additional expenditure. Three years practical use of the system here explained, leads him to believe that it will accomplish this result; for with its aid, the catalogues, shelf lists, indexes, and cross-references essential to this increased usefulness, can be made more economically than by any other method which he has been able to find. The system was devised for cataloguing and indexing purposes, but it was found on trial to be equally valuable for numbering and arranging books and pamphlets on the shelves.

The library is first divided into nine special libraries which are called Classes. These Classes are Philosophy, Theology, &c., and are numbered with the nine digits. Thus Class 9 is the Library of History; Class 7, the Library of Fine Art; Class 2, the Library of Theology.

These special libraries or Classes are then considered independently, and each one is separated again into nine special Divisions of the main subject. These Divisions are numbered from 1 to 9 as were the Classes. Thus 59 is the 9th Division (Zoology) of the 5th Class (Natural Science). A final division is then made by separating each of these Divisions into nine Sections which are numbered in the same way, with the nine digits. Thus 513 is the 3d Section (Geometry) of the 1st Division (Mathematics) of the 5th Class (Natural Science).

This number, giving Class, Division, and Section, is called the Classification or Class Number, and is applied to every book or pamphlet belonging to the library. All the Geometries are thus numbered 513, all the Mineralogies 549, and so throughout the library, all the books on any given subject bear the number of that subject in the scheme.

Where a 0 occurs in a class number, it has its normal zero power. Thus, a book numbered 510, is Class 5, Division 1, but no Section. This signifies that the book treats of the Division 51 (Mathematics) in general, and is not limited to any one Section, as is the Geometry, marked 513. If marked 500, it would indicate a treatise on Science in general, limited to no Division. A zero occurring in the first place would in the same way show that the book is limited to no Class.

The classification is mainly made by subjects or content regardless of form; but it is found practically useful to make an additional distinction in these general treatises, according to the form of treatment adopted. Thus, in Science we have a large number of books treating of Science in general, and so having a 0 for the Division number.

These books are then divided into Sections, as are those of the other Classes according to the form they have taken on. We have the Philosophy and History of Science, Scientific Compends, Dictionaries, Essays, Periodicals, Societies, Education, and Travels,--all having the common subject, NATURAL SCIENCE, but treating it in these varied forms. These form distinctions are introduced here because the number of general works is large, and the numerals allow of this division, without extra labor for the numbers from 501 to 509 would otherwise be unused. They apply only to the general treatises, which, without them, would have a class number ending with two zeros.

A Dictionary of Mathematics is 510, not 503, for every book is assigned to the most specific head that will contain it, so that 503 is limited to Dictionaries or Cyclopedias of Science in general. In the same way a General Cyclopedia or Periodical treats of no one class, and so is assigned to the Class 0. These books treating of no special class, but general in their character, are divided into Cyclopedias, Periodicals, etc. No difficulty is found in following the arithmetical law and omitting the initial zero, so these numbers are printed 31, 32, etc., instead of 031, 032, etc.

In other words:

* 000: Computer Science, Information and General Works

* 100: Philosophy and Psychology

* 200: Religion

* 300: Social Sciences

* 400: Language

* 500: Pure Science, not covered under any of these other categories

* 600: Technology

* 700: Arts and Recreation

* 800: Literature

* 900: History and Geography

Most entries on this blog would fall under 700, with Music coming in at the 780s, Movies and Television at 792, and Sports at 796; or 900, under History, with 920 being Biography, the 930s for the History of the Ancient World (not coverable here), the 940s for the History of Europe, the 950s for Asia, the 960s for Africa, the 970s for North America, the 980s for South America, and the 990s for "Other Areas," like Oceania (Australia, New Zealand and Pacific islands) or the polar regions.

A book with a Dewey number of 000 would be fore computer science. A book with a Dewey number 999 would be for "extraterrestrial worlds." If the sports entries in this blog were published in book form (unlikely to happen in my lifetime), the sticker on the spine would read 796 PAC, for sports and the 1st 3 letters of my surname. If I included only those entries relating to baseball, it would be 796.357 PAC.

In 1897, when the present Library of Congress building opened, it instituted its own system, the Library of Congress Classification. While some libraries have adopted it, the Dewey Decimal System remains considerably more popular. 

From 1883 to 1888, Melvil Dewey was the chief librarian at the Columbia College Libraries; then, through 1906, the director of the New York State Library. In 1895, at Lake Placid, New York, he and his wife Annie founded the Lake Placid Club, which, by 1924, helped to establish the Winter Olympics, which have been hosted in Lake Placid in 1932 and 1980. In 1926, he moved to Florida, and established a town named Lake Placid there. He died there in 1931.

In the years since his death, unsettling revelations about him reached the public, including racism, anti-Semitism, and sexual harassment of women. His System has been of great help to anyone using a library, either employee or visitor; but he must be forever consigned to the realm of, "Yes, but... "

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July 1, 1876 was a Saturday. The only professional sports league in North America at the time was baseball's National League, and 2 games were played in it on this day. The Boston Red Stockings beat the Louisville Grays, 10-2 at the Louisville Baseball Park in Kentucky. And the Chicago White Stockings beat the Philadelphia Athletics, 18-10 at the State Street Grounds in Chicago.

This version of the Philadelphia Athletics dropped out of the NL after the season, while the Grays folded after the 1877 season. The Boston team eventually became the Boston, Milwaukee and Atlanta Braves; while the Chicago team became the Cubs, and both teams would see their original names adopted by teams that began play in the American League in 1901: The Boston Red Sox and the Chicago White Sox.