UNIVERSAL PORTLAND CEMENT CO. 
59 
togelher, and to cut a hole 4x43^2 inches in size in the center of each rib 
(see page 62), into which vertical members, consisting of two 2x4's 
spliced together, must fit. Sixteen ribs make two complete circles. 
The 2x6-inch cleats are made of 2x6-inch planks, cut off in lengths of 
3 feet. The outer edge of the cleat is cut to the same circle as the outer edge 
of the ribs. Four 9/16-inch holes should be drilled along the center line 
of each cleat to receive the 3^-inch bolts, by which each will be secured 
with the two adjoining ribs. The lx4-inch flooring boards are sawed up 
into 3 foot lengths to make vertical surface boards for the inner form. 
To assemble each segment of the inner form, nail the lx4-inch flooring 
E'k4" wedge 
Faced with 
qali/anized iron 
Perspective of Inner Wall Form, showing position of 2-inch by 4-inch uprights upon which the form 
is raised. 
Burr 
-e ^^4" Cleats 
Z 4' Tread 
'o^ ^atcheo 
flooring 
£-11 
■Layer of tar />a^er 
^ Hook 
3^ 
Two-ply Wooden Door for Continuous Doorway in either monolithic or concrete block silo. 
