Judson Freeman Clark (27 July 1870,
Queens County, Prince Edward Island
Queens County is a county in the province of Prince Edward Island, Canada. It is the largest county in the province by population with 89,770 (2021) and land. Charlottetown is the county seat of Queens County, and is the largest city and the capita ...
– 26 July 1942, Los Angeles) was a Canadian forester
and mycologist. He is famous for publishing in 1906, what is now known as the International 1/8-Inch Log Rule (for 1/8-inch
saw kerf), which he modified in 1917 for 1/4-inch saw kerf.
[ (Herman Haupt Chapman (1873–1964) was the ]E. H. Harriman
Edward Henry Harriman (February 20, 1848 – September 9, 1909) was an American financier and railroad executive.
Early life
Harriman was born on February 20, 1848, in Hempstead, New York, the son of Orlando Harriman Sr., an Episcopal clergy ...
Professor of Forest Management, Yale University.)
Biography
After receiving a B.S. in agriculture from the
University of Toronto
The University of Toronto (UToronto or U of T) is a public university, public research university whose main campus is located on the grounds that surround Queen's Park (Toronto), Queen's Park in Toronto, Ontario, Canada. It was founded by ...
in 1896, Clark taught English and mathematics at the
Ontario Agricultural College
The Ontario Agricultural College (OAC) originated at the agricultural laboratories of the Toronto Normal School, and was officially founded in 1874 as an associate agricultural college of the University of Toronto. Since 1964, it has become affil ...
from 1896 to 1898. In 1898 he matriculated at
Cornell University
Cornell University is a Private university, private Ivy League research university based in Ithaca, New York, United States. The university was co-founded by American philanthropist Ezra Cornell and historian and educator Andrew Dickson W ...
, graduating there with A.M. in 1899 and Ph.D. in botany in 1901. At Cornell University, upon the resignation of Professor
Filibert Roth, Clark was appointed assistant professor and, after six months' study in Germany and Switzerland, started work in January 1902. He "handled courses in timber physics, mensuration, dendrology, and silviculture."
Clark resigned in 1903 from Cornell University and worked briefly for the
United States Bureau of Forestry, before he was appointed in 1904 a provincial forester in Ontario as a member of the staff of the
Crown Lands Department.
For many years he was "the senior member of the firm of consulting foresters, Clark and Lyford, Ltd., in Vancouver, British Columbia."
[
He married Eva Couch (b. 1872). The marriage produced at least one child, a daughter.
]
International 1/4-inch log rule
For a 20-foot log:
V= (0.995D2 – 1.221D – 1.719), with
V= volume in board feet, and
D= diameter measured in inches at the small end, inside bark
See also
* Girard form class
Girard form class is a form quotient calculated as the ratio of diameter inside bark at the top of the first 16 foot log to the diameter outside bark at breast height ( DBH). Its purpose is to estimate board-foot volume of whole trees from measur ...
Selected publications
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*
Chapter XXII. Chemistry and toxicology of mushrooms
in:
References
External links
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{{DEFAULTSORT:Clark, Judson Freeman
1870 births
1942 deaths
Canadian foresters
University of Toronto alumni
Cornell University alumni
Cornell University faculty
People from Queens County, Prince Edward Island
Canadian expatriates in the United States