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Melvil Decimal System: 621.434

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

Dewmoji: 💡 > 🔩 > 🏭 > ? > ? > ?

0
Information
183,829
ℹ️
1
Philosophy and Psychology
172,351
💭
2
Religion
443,755
🙏🏽
3
Social Sciences
952,115
👫
4
Language
123,707
💬
5
Mathematics and Science
297,296
🔬
6
Technology
692,375
💡
7
Arts and Recreation
669,452
🎨
8
Literature
891,726
📚
9
Biography and History
567,666
🗿
60
General Technology
6,663
💡
61
Medicine
229,772
💉
62
Engineering
113,470
🔩
63
Agriculture & Animal Husbandry
64,632
🌱
64
Home Economics
125,409
🏠
65
Business
109,750
👔
66
Chemical Technology
13,629
🚀
67
Manufacturing
5,473
📦
68
Handicraft and Occupations
14,823
🔨
69
Building
8,754
👷
620
Engineering
15,072
🔩
621
Mechanical Engineering and Machinery
35,206
🏭
622
Mining Engineering and Mines and Mineral Resources
2,557
🕳
623
Military Engineering and Marine Engineering
11,179
624
Civil Engineering
6,203
🌉
625
Road and Railroad
3,572
🛤
626
--
29
🤷
627
Hydraulic Engineering
1,236
🌊
628
Sanitary; Municipal
5,391
🚽
629
Other Branches
33,025
🌿
621.0
704
621.1
Steam engineering
412
621.2
Hydraulic machinery
190
621.3
Electric engineering
24,694
621.4
Heat engineering
2,758
621.5
Pneumatic machinery and Compressed air and Refrigeration and refrigerating machinery
322
621.6
Fans (Machinery) and Pumping machinery
109
621.7
Production engineering and Factories and Machine-shop practice
89
621.8
Other mechanical engineering topics
1,946
621.9
Machine-tools
957
621.40
639
621.41
2
621.42
8
621.43
Internal combustion engines
460
621.44
39
621.45
Windmills
122
621.46
177
621.47
Solar engines
268
621.48
786
621.49
621.430
17
621.431
1
621.432
1
621.433
44
621.434
47
621.435
57
621.436
57
621.437
10
621.438
2
621.439
621.4340
11
621.4341621.4342
1
621.4343621.4344621.4345621.4346621.4347621.4348621.4349

Works under MDS 621.434

1–38 of 38 titles | covers | shelf

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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