UNIVERSITY OF MINNESOTA OFFERS COURSE IN LUMBER USES 



1207 



HOW WOODED AREAS ARE DEFINED BY CAMERA FROM 15,000 FEET IN THE AIR 



The strips o£ white and grey in blocks represent cultivated land, the difference in shading being accounted 

 for by various crops, hay, grain, stocked and uncut fields, meadow, etc. 



graphs were taken with a stereoscopic camera they could 

 be viewed through a stereoscope and undulations of the 



ground which would tell the 

 direction of the flow of streams 

 observed. I should imagine, 

 however, that the map would be 

 sufficient to show this. 



If a stated altitude is main- 

 tained in taking all the photo- 

 graphs they will naturally be of 

 the same scale and a continuous 

 photographic map of any area 

 can be obtained. Each company 

 could have a natural photograph 

 of its own limits hanging on the 

 wall, could see exactly where 

 logging is going on, and if they 

 wish to do so, could keep track 

 of the progress of the work. 



I do not for a moment sug- 

 gest that photography would be 

 a means of dispensing with 

 cruising in the woods, but I 

 think that it would be of great 

 assistance to cruisers and event- 

 ually they will all want to be- 



come enthusiastic interpreters of air photographs. — 

 (From the Canadian Forestry Journal of March. 1919.) 



UNIVERSITY OF MINNESOTA OFFERS COURSE IN 



LUMBER USES 



T UMBER dealers, manufacturers of timber products 

 '-^ contractors and carpenters, who have need of 

 specific instruction in the proper selection of the material 

 used in their industry, will find in the course, "Lumber 

 and Its Uses," offered by the General Extension Division 

 of the University of Minnesota, just what they have been 

 looking for. The course is based upon R. S. Kellogg's 

 text by the same name, and uses as supplementary ma- 

 terial a large number of valuable pamphlets issued by 

 lumber associations on grades, sizes, characteristics, etc., 

 of the various woods. It also furnishes a valuable bibli- 

 ography on such subjects as preservation and seasoning, 

 strength tests, grading and scaling, as well as in the gen- 

 eral field. 



The kind and grade of wood selected for any use should 

 be the one best adapted to that use, all things considered. 

 The timber dealer must know the qualities of the material 

 he handles well enough to select the best for his own use 

 or that of his customers. If a cheaper timber properly 

 preserved can replace a more costly kind, he should know 



it. Timber having been in use so long, it is falsely 

 assumed that dealers know the material well. They do 

 know it in a general way ; but it is only in recent years 

 that specific information regarding woods has been 

 sought in laboratory and testing room and given to the 

 public. The matters of wood structures, of tests of 

 strength, durability, preservation and other questions are 

 now being settled in a scientific manner. Results of such 

 tests are included in the correspondence course given by 

 the University of Minnesota. 



Many persons arc now interested iii the use of wood in 

 the manufacture of airplanes either as a matter of gen- 

 eral interest or with the idea of becoming inspectors of 

 these woods. It is, of course, impossible to train an in- 

 spector in such a short course as this ; but much valuable 

 information along this line can be obtained as a sound 

 basis for future work. Only a true understanding of the 

 qualities and peculiarities of wood structure can give an 

 adequate idea of the difficulties encountered in this, or, 

 indeed, in any form of wood manufacture. 



WE WANT TO RECORD YOUR MEMORIAL TREE PLANTING. PLEASE ADVISE 

 THE AMERICAN FORESTRY ASSOCIATION, WASHINGTON, D. C. 



