Eyepiece for measurement of lengths and angles by a microscope
First Claim
1. An eyepiece for angle measurements by a microscope, said eyepiece comprising housing means including a main housing (7) containing eyepiece lens means (8, 9) and an extension housing (6) telescopically connected to the main housing, a gravity ball within said extension housing to provide an artificial horizon observable by a person looking into said eyepiece, and a reticle also within said extension housing, said reticle having both a diametrically extending linear scale and a circumferentially extending angular scale, said angular scale being so placed with relation to said gravity ball that said angular scale may be read using one lateral edge of said gravity ball as a reference point.
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Accused Products
Abstract
An eyepiece for use on a microscope when lengths and angles are to be measured. Two glass plates extending perpendicular to the optical axis of the eyepiece are spaced axially from each other to form between them a chamber containing a steel ball which is free to move, by gravity, to the lowest part of this chamber and which thus forms an artificial horizon. One of the glass plates, preferably the one farthest from the eye of the observer, is formed as a reticle, graduated with a diametrically extending linear scale and also with a circumferential series of radially extending angular graduations, read in conjunction with the steel ball to make the desired angular measurements.
77 Citations
7 Claims
- 1. An eyepiece for angle measurements by a microscope, said eyepiece comprising housing means including a main housing (7) containing eyepiece lens means (8, 9) and an extension housing (6) telescopically connected to the main housing, a gravity ball within said extension housing to provide an artificial horizon observable by a person looking into said eyepiece, and a reticle also within said extension housing, said reticle having both a diametrically extending linear scale and a circumferentially extending angular scale, said angular scale being so placed with relation to said gravity ball that said angular scale may be read using one lateral edge of said gravity ball as a reference point.
Specification