94 Concrete Silos 



tinuing until a complete circle has been made. The 

 machine is then set on the section of wall thus made 

 and another section is carried around in the same way. 

 The double wall machine makes a 4-inch air space and 

 the walls are adjustable for thickness of from 4 to 6 

 inches. The single wall machine can be adjusted to 

 make walls from 5 to 8 inches thick. The machine is 

 not adjustable to different diameters of silos. 



The Conklin System. Made by the Conklin Construc- 

 tion Company, Hartford, Mich. The molds are of 

 No. 16 black sheet steel held in shape by l^xl^ 

 angles riveted on. The inside forms are also reinforced 

 with l 1 /^ inch channel steel in the center to keep them 

 from buckling. The forms are made in sections 4 feet 

 high, and two complete circles constitute an outfit, 

 sufficient for a day's work of 8 feet of wall. 



The hoist is operated on a center mast of a 4-inch 

 gas pipe and in 10-foot lengths with slip joints. One- 

 inch holes are drilled at proper distances through the 

 center mast for 1-inch pins. The jack bench and spider 

 hub rest on the pins through the center mast. 



There are eight tee irons radiating from the spider 

 hub and supported by rods and chains from the casting 

 above. The rods and chains are adjustable. On the 

 ends of the tee irons are adjustable tee irons or arms 

 that may be taken up or let out for the different sizes 

 of molds. Boards are laid on the tee irons to make a 

 scaffold for the men to operate the machine. 



From every other tee iron are suspended %-inch 

 rods (4 in all) to hold two timbers (2x6 inches), on 

 which a scaffolding is built completely over the inside 

 of the silo. The men stand on that scaffold and do 

 their work inside the job. 



