THE PRESERVATIVE TREATMENT 



OLD TANK 



FIG. 3. TWO-TANK EQUIPMENT WITH CAPACITY OF 60 TO 75 

 POSTS DAILY. This equipment would be suitable for a large farm or a coopera- 

 tive plant for the treatment of a comparatively large number of posts. The cost 

 complete should not exceed $12 to $20. 



FIG. 4. TREATING EQUIPMENT WITH ROUND AND RECTANGULAR 

 TANKS. The long tank is for treating the entire posts in cold preservative after 

 the regulation butt treatment. It is large enough to allow the cold treatment of a 

 large number of posts at one time. The small tank for heating the preservative is 

 of heavy galvanized iron reinforced with angle iron. The large tank is of heavier 

 iron. Two rectangular tanks, one being over a brick fireplace for heating, may be 

 used for short lengths of lumber. 



Courtesy of Iowa Agricultural Experiment Station. 



Eight 



