cross-wires
cross-wires (cross-hairs) Two very thin, black lines or pieces of wire set at right angles to each other in the eyepiece of a microscope. They are normally positioned N–S and E–W, parallel to the alignment of the polarizer and analyser. Many optical properties, e.g. extinction angles, are measured with respect to the position of the cross-wires.
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crossing
cross·ing / ˈkrôsing/ • n. 1. a place where two roads, two railroad lines, or a road and a railroad line cross. ∎ the a… A.t. Cross Company , A.T. Cross Company
A.T. Cross Company
One Albion Road
Lincoln, Rhode Island 02865-3700
U.S.A.
Telephone: (401) 333-1200
Fax: (401) 334-2861
Web site:…
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cross-wires