UNIVERSAL PORTLAND CEMENT CO. 
95 
A small flat collar is pinned in position to the mast about two feet below 
the collar which supports the forms. Two long jacks are then placed on the 
flat top of the lower collar in such a manner as to raise the upper collars 
when the jacks are operated. The mast is provided with holes a short dis- 
tance apart to receive steel pins, and as soon as the jacks have been raised 
to their limit a pin is placed through the mast just below the upper cylin- 
drical collar to prevent the form dropping while the jacks are being moved 
up to a new position. The forms must be loosened, of course, before any 
attempt is made to raise them with the jacks. 
The silos constructed by the Polk System have single walls six inches 
thick, reinforced with twisted steel rods 3^-inch to ^-inch in size. They 
are built with elliptical door openings, one door to every five feet in height. 
Except where especially desired by the owner, roofs and chutes are not sup- 
plied. The Polk System is protected by United States patents. 
Reichert Flexible or Adjustable Silo Molds are manufactured by the 
Reichert Manufacturing Co, of Milwaukee, Wisconsin. The Reichert 
Manufacturing Co. is an old and well established company and 
^anufactur metal molds for monolithic concrete work, of which they are 
ing Co. manufacturers and patentees, have proved their merit for 
considerable time. 
The silo building outfit as furnished by the Reichert Co. consists of 
sectional molds, each two (2) feet in height and two (2) feet in width. 
Smaller plates called fillers can be inserted between the larger molds to 
make up the required diameters. There are also rectangular plates which 
are fastened to the circular molds at any point, and construct the chute 
portion. For every different diameter silo there are two sets of sectional rings, 
which fit snugly to the inside molds, holding the plates to a true circle. 
These rings also act as a support for the sectional adjustable scaffold arms 
radiating from the center. Every outfit has two sets containing eight 
each of the these radial adjustable arms, making sixteen arms in all. 
In the center of the silo a halved collar bolted together acts as the 
other end support for the scaffold arms. Each half is attached to one 
scaffold arm, so that when the scaffold is raised, all that is necessary is 
to loosen the bolts holding the two halves of the collar together. This 
collar has a flat shoulder projecting about 3 inches from the center. On 
the outside edge there are slots to receive the other six scaffold arms. 
The center mast is made up of four (4) sections of pipe, each being 10 
feet in length. This pipe is 2% inches inside diameter, and is 
fastened together by means of couplings. At intervals of 22 inches along 
the pipe there are ^-inch holes, into which small rods are inserted, to act as 
a ladder as well as a support for the collar which in turn holds the scaffold 
rigid. 
The Silo Equipment Co. of Minneapolis has just put on the market a 
new monolithic silo form. The sides of the form are made of 14-gauge gal- 
vanized iron, braced on the inside with steel bars radiating from 
. the center mast. The hoist for lifting the concrete is also con- 
qq nected to the center mast. This form differs from other steel 
forms in that it is supported on the vertical reinforcing rods and 
not on the concrete structure. 
