60 YALE FOREST SCHOOL 

Theodore Donald Tiemann, born December 13, 1907, in New Haven, 
Conn. 
Since his graduation from the Yale Forest School Tiemann ~ 
has been in the employ of the United States Forest Service. 
From 1903 to the fall of 1909 he had charge of the Yale Timber 
Testing Laboratory. During the winter of 1909-10 his head- 
quarters in the Service were in Washington, D. C. At the 
present time he is chief of the section of timber physics at the 
Forest Products Laboratory, Madison, Wis., and is also lectur- 
ing at the University of Wisconsin. He has been engaged in 
this work since the spring of 1910. In 1911-12 he carried on 
experiments in drying eucalyptus in California. He has taken 
out five patents on apparatus and a new method of drying lumber 
in dry kiln. These are dedicated to public use. 
Tiemann is a member of the Congregational church. He is 
a member of the American Society for Testing Materials, the 
Society of American Foresters, the American Forestry Associa- 
tion, the Wisconsin Horticultural Association and the Society 
for Protecting New Hampshire Forests. . 
He has published: The mechanical relation of force and mass, Stevens 
Ind., Oct., 1901, 15 pp., illus.; (With Thomson and Ophiils) Test of 
a Nash gas engine, Stevens Ind., Oct., 1897, illus.; A new hypsometer, 
Stevens Ind., Jan., 1904, illus., also For. Quart., 1904; The structure of 
red gum wood, Bull. 58, Forest Service, 1905, illus. with scale drawings 
from the microscope; The effect of moisture and other extrinsic factors 
upon the strength of wood, Proc. Am. Soc. for Test. Mat., VII, pp. 
582-506, illus. 1907; Methods for making discounts for defects in 
scaling logs, and cull rule, For. Quart., III, pp. 354-357, 1905; The effect 
of speed of testing upon the strength of wood and the standardization 
of tests for speed, Proc. Am. Soc. for Test. Mat., VIII, 16 pp., illus. 
by diagrams, 1908; Some results of dead load bending tests of timber 
by means of a recording deflectometer, Proc. Am. Soc. Test. Mat., IX, 
illus. 1909; The microscopic structure of wood in its relation to 
penetration by preservatives, Bull. 107, Am. Ry. Eng. & Maint. of Way 
Ass’n, 1909, 16 pp., illus. by microphotographs; The physical structure 
of wood in relation to its penetrability by preservative fluids, Bull. 120, 
Am. Ry. Eng. & Maint. of Way Ass’n, 1910, 16 pp., illus. by 18 photo- 
micros; The theory of impact and its application to the testing of 
materials, Jrl. Franklin Inst., Oct. & Nov., 1909, 52 pp. illus. by diag.; 
The log scale in theory and practice, summarizing results of an experi- 
mental research carried on at the mills, Proc. Soc. Am. Foresters, 1910; 
The microscopic work of the laboratory of forest products on the struc- 


