UNIVERSAL PORTLAND CEMENT CO. 
79 
Multiplex Concrete Machinery Co., Elmore, Ohio. 
Northwestern Distributing Co., Sioux City, Iowa. 
Sioux City Engine and Machinery Co., Sioux City, la. 
Summer Bros. Mfg. Co., Urbana, III. 
U. S. Gas Machine Co., Muskegon, Mich. 
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Home-made 
Molds 
long, 8 
with 
Home-made silo block mold. 
The mold shown above is a modification of that used by Wm. Stoll, 
of Lansing, Mich., to construct blocks for his silo. It can be used to 
make blocks of any length up to 24 inches and of any width up 
to 8 inches. The height of the blocks may be 8 inches or less. 
The mold can be made from a piece of old railroad tie 30 inches 
inches wide and 63^ inches high sawed on the arc of a circle, 
« diameter 4 inches greater than that of the inside of the silo. 
One-half -inch holes are drilled 1>2 inches from each end to receive 18- 
inch bolts, by which the sides of the mold are held at the desired distance 
apart. The end pieces are made of 1-inch planed lumber and have tapered 
wooden blocks 8 inches long, 5 inches wide and %-inch thick screwed to 
them for the purpose of making end cores on the blocks. The end pieces 
are held in place by wedge-shaped wooden blocks inserted between them 
and the bolts. If hollow blocks are desired, the air spaces may be pro- 
vided by cores made of tapered 4x4-inch pieces. The inside of the mold 
should be well greased before use to prevent the concrete from sticking. 
Although concrete blocks are made in a large variety of sizes, those 
most commonly used in silo work are 8 inches high, 8 inches thick and 
either 16 or 24 inches long, with half and quarter lengths as re- 
Bhck quired. Blocks of these sizes are recommended as preferable to 
those less than 8 inches in height which require more labor to 
lay because of the greater number required,^ or blocks more than 8 inches 
in height which are unhandy because of their weight. 
