cross wires

plural noun

Its defects are that it has no real focus where cross-wires can be placed, and that the field of view is very small.

Place the eye-piece with cross wires in the telescope, with the cross in the shape of an X.

And the forward sight will be a ring with cross wires in it.

The cross-wires, which should be of a stronger gauge, are then put in.

The angles of the triangles were measured with a quadrant furnished with a telescope having cross-wires.

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