It covers-the period from to July 1, , and includes published articles, reference books, and patents, the latter being listed only after The references are grouped chronologically as they appeared in the reference sources. This does not necessarily mean that the year in which the subjects originally appeared is the same as the one in which they are listed in the bibliography, since abstracting and publication of references involves a necessary time lag.
This is particularly true in the case of foreign articles. In any event, this chronological arrangement provides a rough indexing by years, Complete author and subject indexes are provided at the end of the bibliography. Patents are indicated in the author index by the letter P following the page reference. The sources of the references and annotations are as follows.
The items from Industrial Arts Index include no annotations, but usually the title indicates quite well the subject of the article. The abbreviations "il.
The sub-headings used after are essentially those used by Engineering Index, some new ones being used where a subject seemed to warrant it. Convention papers are frequently abstracted from preprints or advance papers. The Engineering Index Service lists the papers again when they appear in the official proceedings or transactions, giving page references to discussions of the papers if any.
These second listings are included in this bibliography, the abstract or annotation being found in the previous year. Also included are the original references in Engineering Index. In work involving the listing of such a large number of proper names, errors in initials and spelling creep in.
