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Melvil Decimal System: 621.3

Wording: Technology > Engineering > Mechanical Engineering and Machinery > Electric engineering

Dewmoji: 💡 > 🔩 > 🏭 > ?

0
Information
174,304
ℹī¸
1
Philosophy and Psychology
161,748
💭
2
Religion
423,003
🙏đŸŊ
3
Social Sciences
881,215
đŸ‘Ģ
4
Language
117,983
đŸ’Ŧ
5
Mathematics and Science
273,951
đŸ”Ŧ
6
Technology
639,220
💡
7
Arts and Recreation
651,263
🎨
8
Literature
864,955
📚
9
Biography and History
550,626
đŸ—ŋ
60
General Technology
6,247
💡
61
Medicine
207,679
💉
62
Engineering
102,529
🔩
63
Agriculture & Animal Husbandry
61,837
🌱
64
Home Economics
122,969
🏠
65
Business
99,248
👔
66
Chemical Technology
11,497
🚀
67
Manufacturing
4,874
đŸ“Ļ
68
Handicraft and Occupations
14,120
🔨
69
Building
8,220
👷
620
Engineering
12,098
🔩
621
Mechanical Engineering and Machinery
31,197
🏭
622
Mining Engineering and Mines and Mineral Resources
2,343
đŸ•ŗ
623
Military Engineering and Marine Engineering
10,854
⚓
624
Civil Engineering
5,407
🌉
625
Road and Railroad
3,417
🛤
626
--
29
🤷
627
Hydraulic Engineering
1,059
🌊
628
Sanitary; Municipal
4,548
đŸšŊ
629
Other Branches
31,577
đŸŒŋ
621.0
536
621.1
Steam engineering
377
621.2
Hydraulic machinery
172
621.3
Electric engineering
21,829
621.4
Heat engineering
2,248
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
621.30
366
621.31
2,857
621.32
266
621.33
22
621.34
77
621.35
23
621.36
1,810
621.37
81
621.38
Electronics, Communications.
13,619
621.39
Computers
1,749

Works under MDS 621.3

21,829 results. First 2,000 shown.

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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.

MDSScheduleRatioCount
005.43Information > Computing And Information > Computer Software > Compilers And Operating Systems > Unix-Like19.8119
005.13Information > Computing And Information > Computer Software > Programming > Languages17.3312
537Mathematics and Science > Physics > Electricity16.6116
005.4Information > Computing And Information > Computer Software > Compilers And Operating Systems 15.1286
005.44Information > Computing And Information > Computer Software > Compilers And Operating Systems 14.8133
005.1Information > Computing And Information > Computer Software > Programming14.4504
004.6Information > Computing And Information > Computer Hardware > Networking14280
001.6Information > Computing And Information > Knowledge > Computer Science13.8165
001.64Information > Computing And Information > Knowledge > Computer Science13.7137
004.1Information > Computing And Information > Computer Hardware > By Computer Type12.4112
005.8Information > Computing And Information > Computer Software > Computer Security11.5138
530.1Mathematics and Science > Physics > Physics > Theoretical Physics10.8162
004Information > Computing And Information > Computer Hardware10.8755
005Information > Computing And Information > Computer Software10.51453
530Mathematics and Science > Physics > Physics9377
00XInformation > Computing And Information8.92784
005.2Information > Computing And Information > Computer Software > Programming For Specific Environments7.9135
515Mathematics and Science > Mathematics > Analysis7.9189
53XMathematics and Science > Physics7.8652
006.6Information > Computing And Information > Special Topics > Computer Graphics6.9104

Related tags

19th century (106) Amateur Radio (166) American History (124) audio (114) biography (1,959) circuits (105) computer (193) computer science (168) computers (425) computing (109) DIY (199) ebook (194) EE (165) electrical (190) electrical engineering (339) electricity (450) electronics (1,952) engineering (662) ham radio (125) hardware (157) history (831) home improvement (201) home repair (104) how-to (177) inventions (149) inventors (515) math (195) music (210) network (191) non-fiction (1,744) physics (323) radio (373) reference (406) science (1,447) signal processing (122) technology (514) Tesla (109) textbook (322) Thomas Edison (183) to-read (295)

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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