Concrete Silos 



149 



bolts also extend upward every 4 feet in the joints of 

 the top course of blocks, to anchor the roof, which 

 may be of any type. 



Dave-tail Silo Block. The Lansing Company, Lan- 

 sing, Mich., manufacture what is called the Dove-tail 

 silo block ma- 

 chine. This ma- 

 chine makes a 

 hollow silo block 

 with dove-tail 

 openings at each 

 end. Where these 

 openings come 

 together, they fit Dove-tali siio Block, 



over a small countersunk hole in the middle of the 

 block below. The dove-tail opening is filled with soft 

 mortar which finds its way into the countersunk hole 

 and binds the blocks together both horizontally and 

 vertically. A small groove is also provided in the top 

 of each block for the purpose of laying in reinforcing 

 wire. 



The machine consists of a base and a flask or mould. 

 The mould consists of a front and back plate, two 

 end plates, center cores, dove-tail end cores, extra 

 face plate for half size blocks, and dividing plate. The 

 two end plates fit into lugs in the front plate and the 

 back plate is held in position by two end levers. The 

 mould is of the self-truing type and will produce 

 blocks of an attractive design. It is furnished in 12, 

 14, 16 and 18-foot diameters. Each size of block can 

 also be used for a silo of a diameter 2 feet larger 

 than the stated size. It is equipped for either 9 or 

 10-inch blocks, 16 inches long, 8 inches high. The 



