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Melvil Decimal System: 621.0

Wording: Technology > Engineering > Mechanical Engineering and Machinery > Not set

Dewmoji: ๐Ÿ’ก > ๐Ÿ”ฉ > ๐Ÿญ > ?

0
Information
174,113
โ„น๏ธ
1
Philosophy and Psychology
161,504
๐Ÿ’ญ
2
Religion
421,186
๐Ÿ™๐Ÿฝ
3
Social Sciences
879,963
๐Ÿ‘ซ
4
Language
117,771
๐Ÿ’ฌ
5
Mathematics and Science
273,587
๐Ÿ”ฌ
6
Technology
638,580
๐Ÿ’ก
7
Arts and Recreation
650,093
๐ŸŽจ
8
Literature
863,222
๐Ÿ“š
9
Biography and History
549,410
๐Ÿ—ฟ
60
General Technology
6,238
๐Ÿ’ก
61
Medicine
207,511
๐Ÿ’‰
62
Engineering
102,394
๐Ÿ”ฉ
63
Agriculture & Animal Husbandry
61,747
๐ŸŒฑ
64
Home Economics
122,835
๐Ÿ 
65
Business
99,178
๐Ÿ‘”
66
Chemical Technology
11,489
๐Ÿš€
67
Manufacturing
4,873
๐Ÿ“ฆ
68
Handicraft and Occupations
14,104
๐Ÿ”จ
69
Building
8,211
๐Ÿ‘ท
620
Engineering
12,088
๐Ÿ”ฉ
621
Mechanical Engineering and Machinery
31,184
๐Ÿญ
622
Mining Engineering and Mines and Mineral Resources
2,335
๐Ÿ•ณ
623
Military Engineering and Marine Engineering
10,834
โš“
624
Civil Engineering
5,401
๐ŸŒ‰
625
Road and Railroad
3,399
๐Ÿ›ค
626
--
29
๐Ÿคท
627
Hydraulic Engineering
1,060
๐ŸŒŠ
628
Sanitary; Municipal
4,547
๐Ÿšฝ
629
Other Branches
31,517
๐ŸŒฟ
621.0
536
621.1
Steam engineering
377
621.2
Hydraulic machinery
172
621.3
Electric engineering
21,818
621.4
Heat engineering
2,246
621.5
Pneumatic machinery and Compressed air and Refrigeration and refrigerating machinery
274
621.6
Fans (Machinery) and Pumping machinery
99
621.7
Production engineering and Factories and Machine-shop practice
82
621.8
Other mechanical engineering topics
1,780
621.9
Machine-tools
873
621.00
8
621.01
22
621.02
21
621.03
8
621.04
401
621.05
4
621.06
1
621.07
25
621.08
2
621.09
40

Works under MDS 621.0

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Wording

1922 Edition
Modern language
Emoji

"Far Friends"

MDS classes with significant recommendations overlap, excluding ones under the same top-level class.

None

What is MDS?

Melvil stands for "Melvil Decimal System," named after Melvil Dewey, the famous librarian. Melvil Dewey invented his Dewey Decimal System in 1876, and early versions of his system are in the public domain.

More recent editions of his system are in copyright, and the name "Dewey," "Dewey Decimal," "Dewey Decimal Classification" and "DDC" are registered trademarked by OCLC, who publish periodic revisions.

LibraryThing's MDS system is based on the classification work of libraries around the world, whose assignments are not copyrightable. MDS "scheduldes" (the words that describe the numbers) are user-added, and based on public domain editions of the system.

The Melvil Decimal System is NOT the Dewey Decimal System of today. Wordings, which are entered by members, can only come from public domain sources. The base system is the Free Decimal System, a public domain classification created by John Mark Ockerbloom. Where useful or necessary, wording comes from the 1922 edition of the Dewey Decimal System. Language and concepts may be changed to fit modern tastes, or to better describe books cataloged. Wordings may not come from in-copyright sources.

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