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The Purdue Point-Sampling Block

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Experience at Purdue University has demonstrated that the Purdue Point-Sampling Block, a point-sampling gage which utilizes one or two optical wedges (thin prisms), has several advantages over other types of angle gages that are currently used in the field application of point sampling. The mounting of the prism, or prisms, on a wood block and the preparation and use of a convenient slope correction scale are completely described. Bias caused by the vertical displacement of the image when a single prism is rotated is discussed, and methods of minimizing or eliminating this bias are suggested. There is also an explanation of the manner in which an assemblage of two prisms can be used to eliminate vertical displacement. Finally, the use of the two-prism assemblage as a slope-correcting variable basal area factor gage is described; other applications of the assemblage are mentioned.

Document Type: Journal Article

Affiliations: Staff of the Department of Forestry and Conservation, Purdue University, Lafayette, Ind.

Publication date: October 1, 1964

More about this publication?
  • The Journal of Forestry is the most widely circulated scholarly forestry journal in the world. In print since 1902, the Journal has received several national awards for excellence. The mission of the Journal of Forestry is to advance the profession of forestry by keeping forest management professionals informed about significant developments and ideas in the many facets of forestry: economics, education and communication, entomology and pathology, fire, forest ecology, geospatial technologies, history, international forestry, measurements, policy, recreation, silviculture, social sciences, soils and hydrology, urban and community forestry, utilization and engineering, and wildlife management. The Journal is published bimonthly: January, March, May, July, September, and November.

    Also published by SAF:
    Forest Science
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