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Melvil Decimal System: 621.47

Wording: Technology > Engineering > Mechanical Engineering and Machinery > Heat engineering > Solar engines

Dewmoji: 💡 > 🔩 > 🏭 > ? > ?

0
Information
115,954
ℹ️
1
Philosophy and Psychology
115,844
💭
2
Religion
351,090
🙏🏽
3
Social Sciences
554,451
👫
4
Language
75,777
💬
5
Mathematics and Science
181,736
🔬
6
Technology
414,821
💡
7
Arts and Recreation
444,897
🎨
8
Literature
605,140
📚
9
Biography and History
396,598
🗿
60
General Technology
4,675
💡
61
Medicine
132,325
💉
62
Engineering
60,124
🔩
63
Agriculture & Animal Husbandry
41,598
🌱
64
Home Economics
88,244
🏠
65
Business
62,133
👔
66
Chemical Technology
7,172
🚀
67
Manufacturing
3,235
📦
68
Handicraft and Occupations
9,984
🔨
69
Building
5,331
👷
620
Engineering
6,389
🔩
621
Mechanical Engineering and Machinery
18,304
🏭
622
Mining Engineering and Mines and Mineral Resources
1,480
🕳
623
Military Engineering and Marine Engineering
7,044
624
Civil Engineering
2,955
🌉
625
Road and Railroad
2,173
🛤
626
--
20
🤷
627
Hydraulic Engineering
616
🌊
628
Sanitary; Municipal
2,533
🚽
629
Other Branches
18,610
🌿
621.0
266
621.1
Steam engineering
250
621.2
Hydraulic machinery
94
621.3
Electric engineering
12,076
621.4
Heat engineering
1,196
621.5
Pneumatic machinery and Compressed air and Refrigeration and refrigerating machinery
158
621.6
Fans (Machinery) and Pumping machinery
64
621.7
Production engineering and Factories and Machine-shop practice
65
621.8
Other mechanical engineering topics
954
621.9
Machine-tools
523
621.40
263
621.41
1
621.42
6
621.43
Internal combustion engines
224
621.44
20
621.45
Windmills
56
621.46
77
621.47
Solar engines
129
621.48
280
621.49
621.470
5
621.471
5
621.472
2
621.473
1
621.474621.475
3
621.476621.477621.478621.479

Works under MDS 621.47

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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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