Guide line angle indicator

Details Guide line angle indicator Guide line angle indicator

1986-06-05

1987-06-02

Martin, Jr., William D.

Geometrical instruments

Indicator of direction of force traversing natural media

With cord-type straight-line guide or holder therefor

33 1LE, 33369, 33391, 33413, G01C 912

Patent

active

046691952

ABSTRACT:
A lip extends along the free side of the base of a protractor for suspending the protractor upside down from a guide cord. A freely hanging weight or "plumb bob" is suspended from the center point between the protractor base lines. When the plumb bob points to a predetermined angle on the protractor scale, the guide cord will be laid out along the same desired angle from the horizontal.

REFERENCES:
patent: 505937 (1893-10-01), Brown
patent: 1166019 (1915-12-01), Taylor
patent: 1855651 (1932-04-01), Roberson
patent: 3591925 (1971-07-01), Dupin

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