Universal parallel ruler with converted display of displacement

Details Universal parallel ruler with converted display of displacement Universal parallel ruler with converted display of displacement

1979-12-19

1981-06-02

Haroian, Harry N.

Geometrical instruments

Straightedge type

Base attached

33 1M, B43L 1302

Patent

active

042702771

ABSTRACT:
A universal parallel ruler is disclosed. It is an arm-type ruler and includes a first base attached to a drawing board, a first arm attached to the first base, a second base attached to the opposite end of the first arm, a second arm attached on one end to the second base, and a third base attached to the opposite end of the second arm. The third base includes a lead having an x-scale and y-scale attached thereto. The scales define an (x,y) coordinate system. When the x and y scales are horizontal and vertical, respectively, a point (X,Y) may be selected on a set of (x,y) coordinate axes defined by the scales. If the scales are tilted by .theta. degrees, the position of the point (X,Y) may be determined along a new set of coordinate axes defined by the tilt angle .theta. of the scales and may be identified by a new coordinate point (x,y) relative to the new coordinate axes as follows:

REFERENCES:
patent: 3178825 (1965-04-01), Hislop
patent: 3944798 (1976-03-01), Eaton

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