Map reading device

Details Map reading device Map reading device

1979-04-16

1980-11-18

Martin, Jr., William D.

Geometrical instruments

Miscellaneous

Light direction

33 1C, 33403, 33488, 362 26, G01B 356

Patent

active

042337410

ABSTRACT:
The device has a semi-circular housing 10 defined by a linear wall 14 and an arcuate wall 12, with an inturned edge 13, 15 on one side of the housing. Beta light strips 18 are located in the recess beneath the edges 13, 15 so that graduations on the internal walls of the housing can be viewed at night through an opening 16 in the housing.

REFERENCES:
patent: 1087751 (1914-02-01), Ferraris
patent: 1961500 (1934-06-01), Larson
patent: 2011282 (1935-08-01), Hochman
patent: 2424065 (1947-07-01), Stewart
patent: 2561885 (1951-07-01), Prideaux et al.
patent: 3474538 (1969-10-01), Kirkegaard
patent: 3841083 (1974-10-01), Bergey
patent: 4075467 (1978-02-01), Peterson

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