Matrix (numismatics)

In numismatics, a matrix is an intermediate mould used in the process of manufacturing coins. The use of a matrix lengthens the production of dies, but makes for a gain in consistency.

Terminology

The matrix is an "original die": indeed it has its design in the same sense as a die. The design is incised into the matrix, which is used to create punches. Creation of a matrix addresses the basic problem for coinage of multiplying dies, i.e. having enough accurate copies of dies to produce long runs of essentially identical coins.[1][2] The creation of a master punch from a matrix is called "hobbing".[3]

In contrast, a patrix is a type of master punch with a design in relief, used to create dies.[4]

gollark: I can't really do it concurrently because half the operations end up mutating a shared `ImageBuffer`.
gollark: Also, it's really fast, 400ms vs a few seconds for the Haskell program.
gollark: The images are big but I could theoretically drop the color space a bit to shrink them.
gollark: And because of the lack of floats I had to do some of the operations kind of hackily.
gollark: This isn't strictly an exact port, because the Haskell version uses floats and for efficiency this doesn't, but who cares.

References
  1. Billing, Archibald (1875). The Science of Gems, Jewels, Coins, and Medals, Ancient and Modern. Daldy & Hill. p. 94. Retrieved 18 June 2018.
  2. Mechanic's Magazine, Museum, Register, Journal & Gazette. Knight and Lacey. 1834. p. 188.
  3. Salzano, Tammi (2009). Deluxe Canadian coin collecting album. Scholastic Canada. p. 33. ISBN 9780545177399.
  4. Courtney, Yolanda C. S.; Britain), Royal Numismatic Society (Great (2004). Public house tokens in England and Wales c.1830-c.1920. Royal Numismatic Society. p. 117. ISBN 9780901405784.
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