Excerpt from An Extension of the Dewey System of Classification Applied to Metallurgy, Metallography, and Assaying In the present extension of the system the main subdivisions under 669, have been left unchanged with the exceptions, that use is made of the digit by making General Metallurgy, which includes fuels, furnaces, and refractories, and that under is placed metallography, a branch of metallurgy which is growing rapidly and is so closely allied to it that it should be classed near metallurgy. These changes are thought advisable, as 669 (metallurgy) has not been sufficiently extended to cause con fusion. The character (0) has been used throughout this classifi cation as any other digit, for, although after a decimal point, it does not increase the number numerically, yet it acts as a distinct ive symbol. All items pertaining to ore dressing, except in a gen eral way, are excluded, as ore dressing is classed under 622 (min ing). The general forms Of the Dewey classification have been modified to suit the subject, and where it seems desirable they are stated in full. An elaborate system of cross reference does not seem necessary, as the relative index shows where anitem should be placed.
For a person keeping an index on the subjects of metallurgy, metallography, and assaying, and not too many other subjects, it is convenient to substitute a letter for the first three digits, thus for (metallurgy, metallography, and assaying) the letter M. In making small subdivisions it is Sometimes convenient to arrange the subjects in alphabetical order, giving a combination of the decimal with the alphabetical system. Ipor the benefit of persons who wish to extend the system for their own use, blank spaces have been left. Where it seems advisable.
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