Graphic calculator

Details Graphic calculator Graphic calculator

1989-05-15

1991-09-24

Haroian, Harry N.

Geometrical instruments

Distance measuring

33 1N, 33494, G01B 302, B43L 700

Patent

active

050503120

ABSTRACT:
A graphic calculator (10) for use in technical drawing has means for selectively displaying one of a plurality of sets of division markers wherein each set corresponds to a set of scaled division markers of a particular scale rule. Such a calculator effectively provides a scale rule whose divisions may be altered as desired.
Also disclosed is an electronic protractor having a transparent cross-hair viewer for accurately locating the protractor over the lines forming the angle to be measured and means for recording the point at which at least one of said lines extends from under a measuring edge of said protractor.

REFERENCES:
patent: 407515 (1889-07-01), Duffield
patent: 1975400 (1934-10-01), Mayfield
patent: 4158229 (1979-06-01), Woo
patent: 4839833 (1989-06-01), Parhiskari

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