Geometrical instruments – Straight-line light ray type – Combined
Patent
1978-07-19
1980-09-02
Stephan, Steven L.
Geometrical instruments
Straight-line light ray type
Combined
33277, 33278, 33285, G01C 100, G01C 1500
Patent
active
042199395
ABSTRACT:
The present invention relates to a method and device for carrying out a survey of the basal area of a forest stand and the distribution of the individual trees with respect to diameter classes.
The device of the invention comprises a caliper combined with a relascope in such a way that a certain position of the caliper corresponds to a certain sighting-angle. Furthermore the device comprises a sight field located at an observation point. When practicing the method of the invention the tree to be measured is calipered. Then the sighting-angle of the relascope is compared to the sight field and by checking if the sight field is within the sighting-angle it is determined whether the measured tree is within its border line circle or not.
REFERENCES:
patent: 53420 (1866-03-01), Daly
patent: 794071 (1905-07-01), Barbow
patent: 1274315 (1918-07-01), Olin
patent: 3907288 (1975-09-01), Hudak
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