Skip to page content
USDA Forest Service
  
Treesearch

Research & Development Treesearch

 
Treesearch Home
About Treesearch
Contact Us
Research & Development
Forest Products Lab
International Institute of Tropical Forestry
Northern
Pacific Northwest
Pacific Southwest
Rocky Mountain
Southern Research Station
Help
 

Science.gov - We Participate


USA.gov  Government Made Easy


Global Forest Information Service

US Forest Service
P.O. Box 96090
Washington, D.C.
20090-6090

(202) 205-8333

You are here: Home / Search / Publication Information
Bookmark and Share

Publication Information

View PDF (105 KB)

Title: Calibration of the Wedge Prism

Author: Briscoe, Charles B.;

Date: 1957

Source: LSU Forestry Note AESRR-FN-14

Publication Series: Miscellaneous Publication

Description: Since the introduction of plotless cruising in this country by Grosenbaugh and the later suggestion of using a wedge prism as an angle gauge by Bruce this method of determining basal area has been widely adopted in the South. One of the factors contributing to the occasionally unsatisfactory results obtained is failure to calibrate the prism used. As noted by Bruce the inexpensive prisms commonly used require the computation of a basal area factor for each prism. This is done by setting up a target of convenient width (w), sighting on it through the prism, then moving the prism forward or backward at a right angle to the target until one side of the refracted portion of the target exactly coincides with the other side of the unrefracted portion. Measure the distance (d) from the center of the prism to the face of the target.

Keywords: prism, calibration

Publication Notes:

  • We recommend that you also print this page and attach it to the printout of the article, to retain the full citation information.
  • This article was written and prepared by U.S. Government employees on official time, and is therefore in the public domain.
  • You may send email to pubrequest@fs.fed.us to request a hard copy of this publication. (Please specify exactly which publication you are requesting and your mailing address.)

XML: View XML

Citation:


Briscoe, Charles B. 1957. Calibration of the Wedge Prism. LSU Forestry Note AESRR-FN-14. Baton Rouge, LA: Louisiana State University & A & M College, School of Forestry. 2 p.

 


 [ Get Acrobat ]  Get the latest version of the Adobe Acrobat reader or Acrobat Reader for Windows with Search and Accessibility

USDA logo which links to the department's national site. Forest Service logo which links to the agency's national site.