Measuring instrument

Details Measuring instrument Measuring instrument

1981-06-24

1983-08-23

Haroian, Harry N.

Geometrical instruments

Scriber

Sight-line controlled

G43L 1316

Patent

active

043996124

ABSTRACT:
A measuring instrument in the form of a plotter has a part-reflecting mirror device and a measuring mark or index which may be moved in X, Y and Z directions into coincidence with an image produced by the mirror device of an object to be plotted, contoured or measured, and means associated with the measuring mark or index for producing a plot, contour or measurement of the object, the mirror device comprising two parallel sheets of transparent material having the same optical properties and the same thickness, the image reflected by one or both of the adjacent surfaces being substantially stronger than any images reflected by the remaining surfaces of the sheets.

REFERENCES:
patent: 216460 (1979-06-01), Rosquist
patent: 2465617 (1949-03-01), Trorey

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