The Mirror Caliper, A New Optical Dendrometer

Joe P. McClure

Treesearch

The Mirror Caliper, A New Optical Dendrometer

Informally Refereed

Authors:

Joe P. McClure

Year:

1969

Type:

Research Note

Station:

Southern Research Station

Source:

Res. Note SE-112. Asheville, NC: U.S. Department of Agriculture, Forest Service, Southeastern Forest Experiment Station. 5 p.

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Download (PDF 456 KB): https://research.fs.usda.gov/download/treesearch/2787.pdf

Abstract

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.

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.