surface plate

noun
Machinery. a flat plate used by machinists for testing surfaces that are to be made perfectly flat.
Also called planometer.


Origin:
1840–50

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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Collins
World English Dictionary
surface plate
 
n
another name for faceplate

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Example sentences
The calibration process which is described is fairly simple and requires two mirrors, two autocollimators, and a surface plate.
Openings with sleeves cast in place in masonry do not require fasteners into the surface plate.
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