Geometrical instruments – Straight-line light ray type – Multisight line
Patent
1983-09-12
1985-02-05
Little, Willis
Geometrical instruments
Straight-line light ray type
Multisight line
33277, G01C 300
Patent
active
044971176
ABSTRACT:
The "Cruiser's Crutch" is a slope correcting basal area angle gauge to be used in variable plot sampling for determining basal area in square feet per acre. It incorporates the critical angle for the 10, 20, 30 and 40 basal area factors. This gauge enables the forester or timber cruiser to make the same basal area measurements that would normally require a critical angle gauge for each factor chosen and at the same time compensates for slopes of from zero to ninety percent. The user selects the factor desired and then holds the instrument a fixed distance from his eye, as determined by the larger balls on the attached charin. The larger ball nearest the angle gauge is for 40 factor measurements; the next larger ball, 30 factor; the third, 20 factor and the last for ten factor measurements. (Other basal area factors between 10 and 40 can be easily added if desired.) User then rotates 360.degree. around a point, keeping his eye over the point at all times and the gauge perpendicular to the slope. Any tree that is large enough to subtend the fixed critical angle of the gauge is considered "in" and is tallied. All trees tallied around the circle are then multiplied by the factor number chosen; the result being equal to basal area per acre.
REFERENCES:
patent: 2090658 (1937-08-01), Zak
patent: 3409987 (1968-11-01), New
patent: 3908281 (1975-09-01), Fox
patent: 4219939 (1980-09-01), Turen
Sullivan James H.
Wrobley A. Ray
Little Willis
Martin Herbert L.
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