io The Colorado Experiment Station. 
to interfere with the placing of the reinforcement, the tamping of 
the mixture, and the smoothing off of the top of the post at the 
finish. ^ 
The cast iron molds being heavy, are rather hard to handle, and 
this feature, in connection with the high price of them, explains 
why they are not more commonly used. 
In the second class of molds (molds for poured posts) we find 
a far greater variety. The more common forms are made of sheet 
Figure 2. 
Different Types of Post Molds.—1. A 5-inch home made mold for mak¬ 
ing poured or tamped posts. 2. An 8-inch home made mold for making 
corner posts. 3. A 4-inch commercial post mold. 4. A 4-inch heavy sheet 
iron mold. 5. A 7-inch heavy sheet iron mold for corner posts. 6. A trian¬ 
gular sheet iron mold. 7. A commercial reinforcing truss. 8. A double 
mold lined with sheet iron. 9. A heavy cast iron mold made especially for 
tamped posts. 
iron, either galvanized or plain. For posts having a continual taper 
from top to bottom, sheet iron molds prove very satisfactory, pro¬ 
viding sufficiently heavy material is used in their construction. A 
mold made of thin iron soon loses it shape and the posts made in 
them are necessarily unsightly. If properly taken care of, there is 
no advantage whatever in galvanized iron molds over those made of 
plain iron. 
