Education and demonstration – Geography – Map or terrain model
Patent
1987-10-21
1989-06-06
Grieb, William H.
Education and demonstration
Geography
Map or terrain model
G09B 2910
Patent
active
048367850
ABSTRACT:
The device facilitates the quick location of a wanted detail depicted on information material, which is divided into at least two grid squares by a large-scale grid of lines at an angle to each other. At least one of these grid squares contains the wanted detail. A fine division is provided on at least one of these lines and an indicator unit, which extends crosswise to the line across at least one grid square of the large-scale grid, is movably disposed along the finely divided line. The indicator unit is disposed as at least one thread-like line. At least two of the thread-like lines intersect at the same angle as the lines defining a grid square. Two of the intersecting thread-like lines are movably disposed independently of each other on each of a line associated to each of a line.
REFERENCES:
patent: 1389293 (1921-08-01), Bridwell
patent: 2516569 (1950-07-01), Harris
patent: 3328899 (1967-07-01), Stewart
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