Magnifying device for use with a triangular rule

Details Magnifying device for use with a triangular rule Magnifying device for use with a triangular rule

1980-10-16

1982-02-23

Phillips, Charles E.

Geometrical instruments

Straightedge type

Rules

350116, B43L 700, G02B 2702

Patent

active

043163300

ABSTRACT:
A device for attachment to a triangular rule having longitudinal grooves contains a magnifying glass mounted in a manner to have several modes of positional adjustability. The device includes resilient clamping means which permit facile positioning of the device along the length of the surfaces of the rule. Stablizing means associated with said clamping means prevents the device from toppling during use.

REFERENCES:
patent: 1179142 (1916-04-01), Shaughnessy
patent: 1550522 (1925-08-01), Ehrich
patent: 1773899 (1930-08-01), Kaler
patent: 1806422 (1931-05-01), Shaen
patent: 2011945 (1935-08-01), Mathi
patent: 2355161 (1944-08-01), Holstein
patent: 2502039 (1950-03-01), Floyd
patent: 2941313 (1960-06-01), Levin
patent: 4190322 (1980-02-01), Wortley

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