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Much of the computer's data is directly relayed into the right eyepiece transferred on the visor of the pilots helmet or a visual monocle.
en.wikipedia.org The focal plane is thus located outside of the eyepiece and is hence accessible as a location where a graticule, or micrometer crosshairs may be placed.
en.wikipedia.org The original manual contact angle goniometer used an eyepiece with microscope.
en.wikipedia.org Extremely sensitive levels are attached to the telescope mount to make angle measurements and the telescope has an eyepiece fitted with a micrometer.
en.wikipedia.org Eyepieces are fitted to its focus instead of instruments.
en.wikipedia.org