Meaning of cross-wires | Babel Free

Definitions

Noun. [C1]

Examples

“The collimator consists of a convex lens at the end⟳ of a tube, with a vertical slit, or a pair of cross-wires, in the focus⟳; the telescope is a common telescope with a positive eye-piece, and a pair of cross-wires in the focus⟳ of the eyepiece.”

“This is so adjusted that the image of the cross-wires C formed by reflection at the surface of the glass plate coincides with the cross-wires themselves without parallax.”

“As the telescope is swung round, the slit image for each wavelength is brought into coincidence with the cross-wires.”

“A small telescope, having a magnifying power of about seventy diameters, with cross-wires fixed in its eyepiece, is firmly fixed with adjusting screws to the back of the cell, and pointed through the hole in the cell and mirror towards the focus⟳ of the mirror, where the photo-plate is fixed.”

CEFR level