Melvil Decimal System: 621

Wording: Technology > Engineering, contracts > Mechanical Engineering and Machinery

Dewmoji: 💡 > 🔩 > 🏭

0 Information 196,271 ℹ️	1 Philosophy and Psychology 182,817 💭	2 Religion 463,618 🙏🏽	3 Social Sciences 1,017,722 👫	4 Language 130,463 💬	5 Mathematics and Science 322,970 🔬	6 Technology 751,858 💡	7 Arts and Recreation 695,836 🎨	8 Literature 929,792 📚	9 Biography and History 592,368 🗿
60 General Technology 6,985 💡	61 Medicine 251,982 💉	62 Engineering, contracts 128,146 🔩	63 Agriculture & Animal Husbandry 68,016 🌱	64 Home Economics 130,045 🏠	65 Business 119,888 👔	66 Chemical Technology 15,663 🚀	67 Manufacturing 6,358 📦	68 Handicraft and Occupations 15,511 🔨	69 Building 9,264 👷
620 Engineering 18,961 🔩	621 Mechanical Engineering and Machinery 40,539 🏭	622 Mining Engineering and Mines and Mineral Resources 2,834 🕳	623 Military Engineering and Marine Engineering 11,904 ⚓	624 Civil Engineering 7,081 🌉	625 Road and Railroad 3,892 🛤	626 -- 37 🤷	627 Hydraulic Engineering 1,379 🌊	628 Sanitary; Municipal 6,166 🚽	629 Other Branches 35,353 🌿
621.0 1,010	621.1 Steam engineering 504	621.2 Hydraulic machinery 203	621.3 Electric engineering 28,314	621.4 Heat engineering 3,312	621.5 Pneumatic machinery and Compressed air and Refrigeration and refrigerating machinery 375	621.6 Fans (Machinery) and Pumping machinery 139	621.7 Production engineering and Factories and Machine-shop practice 129	621.8 Other mechanical engineering topics 2,179	621.9 Machine-tools 1,070

Works under MDS 621

40,539 results. First 2,000 shown.

1–50 of 1,949 ( next )

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Wording

1922 Edition

Mechanical

Modern language

Mechanical Engineering and Machinery

Emoji

🏭

"Far Friends"

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

MDS	Schedule	Ratio	Count
005.43	Information > Computing And Information > Computer Software > Compilers And Operating Systems > Unix-Like	16.8	134
005.13	Information > Computing And Information > Computer Software > Programming > Languages	14.5	363
537	Mathematics and Science > Physics > Electricity	14.5	145
005.1	Information > Computing And Information > Computer Software > Programming	11.6	580
005.4	Information > Computing And Information > Computer Software > Compilers And Operating Systems	11.3	315
004.1	Information > Computing And Information > Computer Hardware > By Computer Type	11.1	133
004.16	Information > Computing And Information > Computer Hardware > By Computer Type > Personal Computers	10.8	119
531	Mathematics and Science > Physics > Mechanics	10.7	118
005.44	Information > Computing And Information > Computer Software > Compilers And Operating Systems	10.3	144
004.6	Information > Computing And Information > Computer Hardware > Networking	10.2	296
001.64	Information > Computing And Information > Knowledge > Computer Science	9.9	139
001.6	Information > Computing And Information > Knowledge > Computer Science	9.4	169
530.1	Mathematics and Science > Physics > Physics > Theoretical Physics	9.2	202
005.8	Information > Computing And Information > Computer Software > Computer Security	9.1	163
004	Information > Computing And Information > Computer Hardware	8.2	844
005	Information > Computing And Information > Computer Software	8.1	1652
530	Mathematics and Science > Physics > Physics	8	498
53X	Mathematics and Science > Physics	7.9	970
00X	Information > Computing And Information	6.9	3150
515	Mathematics and Science > Mathematics > Analysis	6.7	227

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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.