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Melvil Decimal System: 621.402

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

Dewmoji: πŸ’‘ > πŸ”© > 🏭 > ? > ? > ?

0
Information
173,995
ℹ️
1
Philosophy and Psychology
161,468
πŸ’­
2
Religion
420,463
πŸ™πŸ½
3
Social Sciences
879,721
πŸ‘«
4
Language
117,736
πŸ’¬
5
Mathematics and Science
273,525
πŸ”¬
6
Technology
638,475
πŸ’‘
7
Arts and Recreation
649,944
🎨
8
Literature
863,011
πŸ“š
9
Biography and History
549,142
πŸ—Ώ
60
General Technology
6,238
πŸ’‘
61
Medicine
207,490
πŸ’‰
62
Engineering
102,369
πŸ”©
63
Agriculture & Animal Husbandry
61,737
🌱
64
Home Economics
122,808
🏠
65
Business
99,162
πŸ‘”
66
Chemical Technology
11,486
πŸš€
67
Manufacturing
4,873
πŸ“¦
68
Handicraft and Occupations
14,101
πŸ”¨
69
Building
8,211
πŸ‘·
620
Engineering
12,088
πŸ”©
621
Mechanical Engineering and Machinery
31,182
🏭
622
Mining Engineering and Mines and Mineral Resources
2,334
πŸ•³
623
Military Engineering and Marine Engineering
10,825
βš“
624
Civil Engineering
5,401
πŸŒ‰
625
Road and Railroad
3,398
πŸ›€
626
--
29
🀷
627
Hydraulic Engineering
1,060
🌊
628
Sanitary; Municipal
4,546
🚽
629
Other Branches
31,506
🌿
621.0
536
621.1
Steam engineering
376
621.2
Hydraulic machinery
172
621.3
Electric engineering
21,817
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
621.40
514
621.41
2
621.42
9
621.43
Internal combustion engines
386
621.44
33
621.45
Windmills
108
621.46
155
621.47
Solar engines
228
621.48
581
621.49
621.400
4
621.401621.402
466
621.403621.404621.405621.406
44
621.407621.408621.409
621.4020
1
621.4021
90
621.4022
111
621.4023
37
621.4024621.4025
49
621.4026621.4027621.4028
4
621.4029

Works under MDS 621.402

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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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