COOPERATIVE; PROJECT 21 



TREATMENT. In the brush treatments two coats will be applied 

 at periods at least twenty-four hours apart. The oil will be applied 

 at a temperature as close to 200 F as possible with wire-bound 

 brushes. The weight of each post will be taken before and after 

 treatment to determine the absorption. The total amount of oil 

 used will also be obtained from the weights of the vessel used to 

 hold the preservative, the latter figure including the losses due to 

 evaporation and dripping. The creosote used will be furnished by 

 the College and will be obtained from a local water-gas plant. (A 

 sample from this concern has already been submitted to the Forest 

 Products Laboratory for examination.) The crude oil will be ob- 

 tained from the Boulder oil fields. Samples of both oils used will 

 be taken at the time of the experiments. 



In the open tank treatments, three runs will be made. The 

 principal objects in these runs will be, ( I ) to determine the relative 

 absorption of the different species when given the same treatment 

 in the round form; (2) to determine a definite time of treatment 

 for lodgepole pine and if possible for Engelmann spruce that can 

 be recommended as efficient (without change of oil bath) for say 

 a five-pound per post absorption; and (3) to furnish posts with a 

 thorough butt treatment of some preservative available for future 

 use for comparison in durability with untreated and brush-treated 

 posts. The preservative will be furnished by the College and will 

 be the same as that used in the brush treatments. The runs will be 

 approximately as follows, though the length of time may be varied 

 during the tests if necessary to obtain the results desired : 

 No. i 2 hours hot o hours cooling 

 No. 2 i hour hot o hours cooling 

 No. 3 i hour hot 6 hours cooling to about 100 F. 



FUTURE WORK. The posts will be set on the College farm by 

 the College authorities in the regular course of their operations. 

 Reasonable care will be taken to see that the posts treated in differ- 

 ent ways shall be set in comparable sites and none should be placed 

 near pig styes, chicken yards, barn yards, etc., where they would 

 be subjected to abnormal conditions as compared with the posts set 

 in the open fields. 



Inspections will be made by representatives of the Forest Serv- 

 ice. Notice of the time when the inspection will be made will be 

 sent to the Fofestry Department of the Agricultural College. Also, 

 should the Forestry Department desire to make an inspection of 

 the posts, notice should be sent to the Director of the Forest Prod- 

 ucts Laboratory at Madison, Wisconsin. A copy of the results of 

 an inspection by either party should be sent to the co-operator not 

 present. 



In accordance with the regular policy of the Forest Service 



