Square level for drawing angles and parallels

Details Square level for drawing angles and parallels Square level for drawing angles and parallels

1980-04-24

1982-10-05

Haroian, Harry N.

Geometrical instruments

Straightedge type

Square and sliding nonpivotal straightedge

33464, 33191, B43L 700

Patent

active

043522475

ABSTRACT:
A square for plotting angles, parallels, and polygonal shapes on the circular surface of a cylindrical body. The square includes a pair of contact arms forming a right angle, and a center arm forming a bisector of the right angle. A protractor frame is slidably attached to the center arm, and a pointer is attached to the arc-shaped portion of the protractor. The square includes a separate attached straightedge parallel to the center arm, and movable in variable spaced relation thereto.

REFERENCES:
patent: 535223 (1895-03-01), Rowell
patent: 1893973 (1933-01-01), Yavicoli
patent: 2348878 (1944-05-01), Behen

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