Protractor-chalkline

Details Protractor-chalkline Protractor-chalkline

1986-07-25

1988-03-22

Martin, Jr., William D.

Geometrical instruments

Straightedge type

Cord type

33 1LE, 33424, 33534, B44D 338, G01C 1516

Patent

active

047319330

ABSTRACT:
A chalkline device situated on a protractor in such a manner which permits the chalkline string to extend from the centerpoint of the protractor's radius past the degree markings on the protractor. By placing the centerpoint side of the protractor on any straight surface and extending the chalkline string past the degree markings any angle measurement can, by the chalkline string, be determined and marked in the same process. The chalkline string serves as both the hand of a dial and a medium for conveyance of the chalk to the surface being marked or measured.

REFERENCES:
patent: 661483 (1900-11-01), Barrie
patent: 1373884 (1921-04-01), Gregory
patent: 1401200 (1921-12-01), Smith
patent: 2586074 (1952-02-01), Memluck
patent: 2673398 (1954-03-01), Baumgart
patent: 3533164 (1970-10-01), Bloom

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