Geometrical instruments – Area integrators – Electrical
Patent
1975-07-24
1977-01-25
Artis, Henry K.
Geometrical instruments
Area integrators
Electrical
33 75R, B43L 706
Patent
active
040043479
ABSTRACT:
A graphics instrument is disclosed for use in drawing and measuring. The instrument includes a pair of coplanar scale members mounted for concentric mutual rotation. A circular graduated scale on the outer member displays angular degree and radian values, and this scale is in register with a circular graduated scale on the inner member which displays both angular and trigonometric function values. Straight edges are formed to extend along axes of each scale member to facilitate measurement and drawing by a marking instrument. In one embodiment the outer member defines a polygon configuration which provides a straight edge, and the straight edge of the inner member extends along a diameter of the latter. In another embodiment the two members are annular and carry radially extending arms which define straight edges upon which graduated linear measurement scales are marked. The inner member is formed with a central opening into which extensions of the two arms project. The inner terminal ends of the arm extensions meet at the center of the two scale members to facilitate drawing the vertex of an angle. The arms may be releasably locked in any selected position about the scale members by means of the eccentric cam locks and the arms may be assembled in inverse position to function as a T-square. A sliding indicator may be moved to a selected position along one arm to facilitate drawing an arc with any radius along the arm while simultaneously measuring the radius and value of the arc which is drawn.
REFERENCES:
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patent: 2822834 (1958-02-01), Hammers
patent: 3388474 (1968-06-01), Rosenvold et al.
Hesse Sarah
Shapiro Justin J.
Artis Henry K.
Shepperd John W.
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