The Purdue Point-Sampling Block
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.
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Document Type: Journal Article
Affiliations: Staff of the Department of Forestry and Conservation, Purdue University, Lafayette, Ind.
Publication date: 1964-10-01
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