Here's another entry from Dick Johnson's Encyclopedia of Coin and Medal Terminology. Interesting phenomena.
-Editor
Molecular Memory.
The surface metal of a struck piece has a tendency to return minutely to its original configuration before it was struck; also called creep or drift. It is imperceptible to the human eye, but can be observed under magnification. This striking problem is cured, somewhat, by a longer extrusion dwell in the press cycle to prevent the metal from springing back while the die is still in the most extended position. Also, of course, it is eliminated by repeated impressions as in multiple striking.
To read the complete entry on the Newman Numismatic Portal, see:
Molecular Memory
(https://nnp.wustl.edu/library/dictionarydetail/516352)
Wayne Homren, Editor
The Numismatic Bibliomania Society is a non-profit organization
promoting numismatic literature. See our web site at coinbooks.org.
To submit items for publication in The E-Sylum, write to the Editor
at this address: whomren@gmail.com
To subscribe go to: https://my.binhost.com/lists/listinfo/esylum
Copyright © 1998 - 2024 The Numismatic Bibliomania Society (NBS)
All Rights Reserved.
NBS Home Page
Contact the NBS webmaster
|