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(mechanical engineering)
Forming an internal screw thread in a hole or other part by means of a tap.
Opening the pouring hole of a melting furnace to remove molten metal.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.



special wounding of growing trees for the purpose of obtaining essential oils, resins, raw rubber, and sugar syrup.

The tapping of rubber trees is the most developed form of tapping in world economy. In the USSR the tapping of pine trees is commercially significant. To a small extent the nut pine Pinus Sibirica and the fir are tapped, and a very valuable balsam used in optics is obtained. In the USSR in the southern Urals and Byelorussia, birch and maple are tapped for their sugar syrup.

The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.


Gently touching a touch-sensitive screen. See tap and touchscreen.
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