Drafting instrument

Details Drafting instrument Drafting instrument

1982-02-08

1984-04-03

Phillips, Charles E.

Geometrical instruments

Straightedge type

Rules

4488, B43L 708

Patent

active

044399286

ABSTRACT:
A drafting instrument is disclosed providing for a large number of independently viewable scales in a single self-contained instrument. A flexible graphics sheet having a large number of scales thereon is attached to two rotatable shafts mounted within a housing. The housing has a viewing slot which allows the display of individual scales on the graphics sheet.

REFERENCES:
patent: 713097 (1902-11-01), Heydrick
patent: 2124550 (1938-07-01), Evans
patent: 2156524 (1939-05-01), Christensen
patent: 2178293 (1939-10-01), Wogeck
patent: 2355585 (1944-08-01), Halstead
patent: 2468191 (1949-04-01), Fullilove
patent: 2651235 (1953-09-01), Burrows
patent: 2736097 (1956-02-01), Coleman
patent: 2832141 (1958-04-01), Taylor
patent: 2954611 (1960-10-01), Wiskoff
patent: 3156981 (1964-11-01), Sutton
patent: 3524258 (1970-08-01), Novak
patent: 3738009 (1973-12-01), Kuwada
patent: 4051599 (1977-10-01), Sinkovec

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