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The Mirror Caliper, A New Optical DendrometerAuthor(s): Joe P. McClure
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
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DescriptionFive 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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CitationMcClure, 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.
- Computer programs for optical dendrometer measurements of standing tree profiles
- Accuracy of Standing-Tree Volume Estimates Based on McClure Mirror Caliper Measurements
- Use of a Non-Metric Digital Camera for Tree Stem Evaluation
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