Geometrical instruments – Straightedge type – Plural straightedges – relatively moveable
Patent
1988-06-27
1989-10-10
Haroian, Harry N.
Geometrical instruments
Straightedge type
Plural straightedges, relatively moveable
33464, G01B 524
Patent
active
048722677
ABSTRACT:
A measuring device is in the form of a triangle with the three legs and associated angles of the triangle being selectively adjustable. Each leg of the triangle is formed by two elongated strips secured in spaced parallel relation. A slot is formed between the pair of strips and receives one strip of each of the two adjacent triangle leg portions. This allows the length of the legs and angles of the triangle to be rapidly adjusted through relative sliding movement of the three leg portions. Each of the three leg portions is provided with a protractor for measuring the respective angle and a linear measuring scale for determining the length of the leg. The main application of the device is to measure all the angles and the lengths of the sides of the triangle with only one setting. By placing each of the three legs on a corner of a triangle all three angle measurements and all three side lenghts may be simultaneously determined. Other functions of the measuring device include making triangles of a certain size, finding the radius of a circle, inscribing an equa-angular triangle in a circle, circumscribing an equa-angular triangle around a circle, bisecting an angle, finding the median of a triangle and finding the altitudes of a triangle.
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patent: 3486232 (1969-12-01), Klauberg
patent: 4208804 (1980-06-01), Lundin
patent: 4638569 (1987-01-01), Dove
Haroian Harry N.
Kearns Jerry T.
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