Scientific ruler

Details Scientific ruler Scientific ruler

1990-08-14

1991-07-23

Will, Thomas B.

Geometrical instruments

Straightedge type

Rules

33488, 33492, 33564, 33354, 350243, B43L 700

Patent

active

050332007

ABSTRACT:
The present invention relates to a scientific ruler incorporated with a concave lens and a convex lens which may be dismantled from the ruler and aligned with each other to compose as a telescope. The concave lens or convex lens may be replaced by a compass. A protractor is provided around the periphery of the concave lens. An inclined plane is formed at either one or both ends of the ruler capable of refracting the sunlight into a rainbow spectrum. Further, a comb and a thermometer are provided. In addition to various mathematic and equal signs and undulate edge there are more space area for indicating name of the user and adhering stickers.

REFERENCES:
patent: 373597 (1887-11-01), McMicken
patent: 708355 (1902-09-01), Harney
patent: 911483 (1909-02-01), Faehrmann
patent: 1498485 (1924-06-01), Schmidtke
patent: 1583138 (1926-05-01), Garnett
patent: 1840135 (1932-01-01), Schutt
patent: 2736097 (1956-02-01), Coleman, Jr.
patent: 4770519 (1988-09-01), Jacques

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