Beam compass

Details Beam compass Beam compass

1976-04-08

1977-10-04

Phillips, Charles E.

Geometrical instruments

Scriber

Curved line

33158, B43L 904

Patent

active

040515990

ABSTRACT:
A beam compass consisting of a triangular scale and two trammel heads, each including a hollow slide body having an outer face and three, approximately equiangularly offset inner faces bounding a passage through the slide body. Guide rails project from the inner faces into respective grooves of the scale. An arm projects from the outer face of each slide body at right angles to the scale, and its free end carries an attaching device for a compass point or writing implement.

REFERENCES:
patent: 586626 (1897-07-01), Rooney
patent: 1629143 (1927-05-01), Bungart
patent: 2512235 (1950-06-01), Lankford
patent: 2539097 (1951-01-01), O'Rourke
patent: 3589013 (1971-06-01), Colon

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