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    Author(s): Joe P. McClure
    Date: 1969
    Source: Res. Note SE-112. Asheville, NC: U.S. Department of Agriculture, Forest Service, Southeastern Forest Experiment Station. 5 p.
    Publication Series: Research Note (RN)
    Station: Southeastern Forest Experiment Station
    PDF: View PDF  (446 KB)

    Description

    Five years of field tests have proved that the mirror caliper--a hand-held, nonmagnifying, optical caliper--is a practical instrument for use in taking upper-stem measurements (diameter outside bark) at any point on a standing tree. Parallel lines-of-sight produce direct-reading measurements within a range of 3.5 to 16.0 inches. Accurate readings can be taken in approximately 30 seconds.

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    Citation

    McClure, Joe P. 1969. The Mirror Caliper, A New Optical Dendrometer. Res. Note SE-112. Asheville, NC: U.S. Department of Agriculture, Forest Service, Southeastern Forest Experiment Station. 5 p.

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