THE POLK SYSTEM MACHINE 



Description The POLK SYSTEM is in reality a com- 

 pletely detailed plan for all kinds of cir- 

 cular monolithic concrete construction. It specifies mix- 

 tures and proportions, it keeps the contractor abreast with 

 the times, it reduces construction costs and insures a 

 definite progress each day, and it makes provision for the 

 safety of laborers. More than all of these, it insures to 

 the farmer a flawless structure which will keep his silage 

 secure against every known foe of good silage. The 

 POLK SYSTEM is much more than a mere machine. 



Machine The POLK SYSTEM machine is an all steel 

 equipment for the erection of circular mono- 

 lithic concrete structures. It has been developed with two 

 things in mind ease of operation and the production of 

 absolutely flawless structures. The POLK SYSTEM, 

 machine automatically keeps the walls plumb, does away 

 with an elaborate, complicated, risky system of scaffold- 

 ing, imposes no strain upon the section of wall already 

 built, and so unifies and simplifies construction that any 

 intelligent workman can easily erect the most perfect, 

 monolithic structure on earth. 



The unifying, simplifying, protected principle of the 

 POLK SYSTEM machine is the use of a centermast. This 

 centermast is erected at the center of the floor of the 

 structure and is carefully plumbed by means of guy wires 

 attached to the top. It is a 4-inch steel pipe provided 

 with a series of transverse holes to receive a heavy steel 

 pin. This pin supports a widely flanged collar which 

 serves to support the jack by which the forms are lifted. 



Resting upon the jack is a hub, consisting of a flanged 

 base collar and a top dished collar connected by a central 

 pipe of sufficient diameter to work easily over the center- 

 mast. From the base collar of this hub radiate steel Tees 

 which are supported from the upper collar by adjustable 

 hanger rods with chain clevises. 



The wall-forming forms are made in two widths four 

 and five feet. Each form consists of eight separable sec- 

 tions, each of which is reenforced and stiffened by a steel 

 angle frame around the edges. The inner and outer steel 



Polk System Machines Render the Service 



