ground. The post being made of one and a quarter inch iron pipe tends to rust 

 away in a few years. This difficulty has been partly overcome by filling it with 

 concrete. 



While the purpose of this disc is to make it difficult for unauthorized 

 persons to remove the post, it also prevents it from being driven into the ground. 

 The method of locating these posts is to dig a long trench at an angle to the 

 ground surface. The post is then put in place and the earth is tamped around it. 

 This is a costly and time consuming procedure. 



The requirements of the new type of post are: easy to drive into the ground, 

 difficult to remove, and long lasting (up to 100 years). 



At the present time a survey post containing an explosive charge in the 

 base is under test. The underlying principle is that after the post has been driven 

 into the ground, the charge is set off, which spreads the specially designed base, 

 thereby making it difficult to pull out of the ground. For long life the post is con- 

 structed of red brass. 



Although some progress has been achieved, considerably more work will 

 be necessary before any definite success can be claimed for this idea. 



Tree Baler 



A power -operated tree baler for use in connection with the "Moisture 

 Retention Materials for Nursery Stock" experiments being conducted at the 

 Kemptville Provincial Nursery was constructed during the winter. 



This machine bales the trees to a pre-determined pressure. Trees 

 baled with this machine are well- suited for transporting to planting areas and 

 dropping from aircraft. 



Miscellaneous Services 

 Besides the main projects described above, numerous smaller services 

 were carried out for other sections of the Research Division. The main ones 



28 



