UNIVERSAL PORTLAND CEMENT CO. 
69 
ning over the little brackets on the uprights. When the outer form is 
raised to a position flush with the inner form, the lower bolt should be 
tightened until the form presses snugly against the wall; spacers should 
then be placed between the forms and the remaining two bolts tightened 
until the proper spacing is secured. The forms are then ready for the next 
filling. 
Immediately before the concrete is placed for each succeeding course, 
the surface of that previously laid should be thoroughly cleaned off and 
Joiining moistened, and coated with a cement and water grout of about the 
Comrses consistency of cream. This precaution is necessary to secure a 
good bond between the courses. It should be observed in all 
cases, as the pressure of the silage is apt to force moisture through any seams 
which might occur because of imperfect bond. Concreting should not be 
discontinued with a course partially completed, but if this is unavoidable 
the concrete surface should be left as nearly horizontal as possible. 
Although some forms are made 3 feet in height, the height of the wall 
built at each filling (after the first) will be 2 feet 6 inches, allowing the 
forms to cover 6 inches of finished wall when in position to be 
WafllatEach ^^^^^ again. Experiments have shown that this is about the 
Fillling t)est height to fill at one time when using such forms, as it makes 
about one-half day's work for the average farm crew when the 
mixing is done by hand. In reasonably good weather it should be possi- 
ble for home labor to raise the forms each morning, refill in the forenoon 
and have the remainder of the day free for other farm duties. 
IMonolithic Silo 14 feet 3 inches by 40 feet, hold- Concrete Block Silo in Minnesota, on G. W. 
iing over 200 tons; built by G. A. Ford of Oswego, Long's farm at Detroit. Courtesy of Holmes 
IN. Y., for county. Stone and Lumber Co., Detroit, Minnesota. 
