Perfect Reinforced Silo Block 



Perfect Reinforced Cement Silo & Cistern Co., Delaware, 0. 



PERFECT SILO BLOCKS are shaped to the radius of the silo, and are 24 

 inches long, 12 inches high and 4 inches thick. The blocks lay up large, re- 

 ducing the cost of laying, while on account of the thin wall they are not too 

 heavy to handle. 



Each block Is reinforced with two iron rods running lengthwise, 6 inches 

 apart. Each rod is looped 6 inches from the end. These loops in the rod 

 coincide with the holes that are formed edgewise through the block 1 Inch 

 in diameter and 6 inches from either end. In laying the blocks these 1-inch 

 openings are filled with cement grout and a rod or dowel pin is pressed 

 through the soft cement, connecting the two blocks. Each pin is inserted in 

 such a way that it passes entirely through one block and half way through 

 the block above and the one below. 



This provides for a continuous lateral rein- 

 forcement around the silo every 6 inches, and 

 the dowel pins that run through the blocks 

 from the bottom to the top of the silo form a 

 vertical reinforcement every 12 inches. 



A strip of netting composed of 7 longitud- 

 inal and 12 vertical steel wires, imbedded in 

 the block just beneath the outer surface, is 

 designed to prevent any liability of cracking 

 of the face of the block. This virtually forms 

 a steel covering in the block near the outer 

 surface of the entire silo. 



To unite the blocks and to overcome the 

 outward pressure or thrust, a two-ply twisted 

 steel cable of No. 8 wire is laid outside of the 

 dowel pins in the mortar between the courses 

 of blocks, in grooves provided for that pur- 

 pose. The ends 

 of these cables 

 ire looped about 

 a continuous 

 gas pipe which 

 extends from 

 the top to the 

 bottom of the 

 structure, 

 through the 

 blocks each side 

 of the doorway. 

 This gas pipe 

 also passes 

 through holes 

 in the ends of 

 the ladder 

 rounds thus the 

 cable and the 

 ladder rungs in 

 connection with 

 the gas pipe 

 form acomplete 

 r e i nforcement 

 around the silo 

 from the top to 

 the bottom, 

 throughout each 

 foot of its 

 height, which 

 r e i nforcement 

 is four times 

 more than suf- 

 ficient to with- 

 stand the pres- 

 sure of the en- 

 silage, but it is 

 so made in or- 

 der to withstand 

 the heat of a 

 possible flre. 



This illustration shows the con- 

 tinuous doorway with ladder rungs 

 across same every alternate course of 

 blocks, and the manner of connecting 

 the ladder rungs and the twisted steel 

 cable by means of the continuous gas 

 pipe passing through the dowel pin 

 holes in the blocks each side of dooi- 

 way. It also shows the rabbet formed 

 in the edge of the doorway blocks 

 to receive the doors. The dotted 

 lines at the right indicate positions of 

 gas pipe, dowel pins, cable, netting 

 and loop wires. 



Perfect" Silos Are Never Adversely Criticizde 



