Method and equipment for measuring the distance between two poin

Details Method and equipment for measuring the distance between two poin Method and equipment for measuring the distance between two poin

1977-06-06

1978-10-10

Moskowitz, Nelson

Electric lamp and discharge devices: systems

Cathode ray tube circuits

Cathode-ray deflections circuits

33 1SP, 128 2V, G01R 1330

Patent

active

041198905

ABSTRACT:
Displays of first and second points are generated on a fluorescent screen. A first mark, which coincides with the display of said first point, is displayed on said fluorescent screen. A linear second mark is displayed on said fluorescent screen. A parameter which controls the position of said second mark on said fluorescent screen is varied in a known manner to move said second mark to a plurality of positions, in each of which said second mark constitutes a display of a circle which is centered on said first point, inclusive of one position in which said second mark is in close proximity to the display of said second point, said parameter having a predetermined, known relation to the radius of said circle so that the value of said parameter is a measure of the distance between said first and second points when said second mark is in said one position and said first mark coincides with the display of said first point. When it is desired to measure the distance between first and second points on a fluorescent screen, the second mark is displayed as at least part of a circle that is centered on said first point.

REFERENCES:
patent: 3027485 (1962-03-01), Davis

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