EXPERIMENT STATION BULLETINS. 2G1 



flooring, whicli sets horizontal, laps 2 inches when in place, as does the 

 paper, on either side of the doorway and rests against the inner surface 

 of the wall. The sections are made to lap upon each other also. See 

 Figs. 2G and 27. These doors are held in place by the pressure of the 

 silage. The ends of the inner layer of boards are beveled back to the 

 wall. 



When the silo was first built the inner surface of the wall was not 

 plastered but w^as treated with an application of a preparation (prob- 

 ably water-glass) which was recommended as having the property of 

 closing the pores of the concrete and thus rendering it air tight. It 

 did not accomplish this result. That year as much as G or 8 inches of 

 all the ensilage next to the wall spoiled completely. Before filling the 

 silo again the inner surface of the wall received a i^ inch coat of rich 

 cement plaster. When the plaster had set it was given a coat of rich 

 cement wash. Since that time there has been no poor silage, so Mr. 

 Parish reports. The writer examined the silage in this silo, in the 

 month of April, 190S, and found that next to the Avail thoroughly bright 

 and sweet. 



Proportions of materials uwed : 



For the foundation, 1 part cement to 7 of gravelly sand. 



For the blocks, 1 part cement to 5 of gravelly sand. 



Floor, made wet, 1 part cement to 5 of gravelly sand. 



Mortar for laying %c<ill and plastering, 1 of cement to 2 of screened 

 sand. 



Wash, cement and water. 



Roof: 



The roof consists essentially of eight rafters ^et at low pitch, covered 

 Avith sheeting (flooring in tlii« case) and the sheeting in turn covered 

 with rubberoid. A section of the roof is removable and through this 

 doorway the ensiling material is introduced. 



This silo was built by contract for |176.00 complete. It has been in 

 use five years. 



A cast iron form was used in making the blocks. Such a form can 

 now be purchased on the market and Avill cost something like .flS.OO. 



Other silos of this type were visited. Most of them were 12 feet in 

 diameter but differed in height and some possessed at least one new 

 feature. A silo owned by William Schipper will illustrate. This silo (see 

 Fig. 28) is 12 feet inside diameter and is 31 feet high. Four feet of 

 this height is below ground. The 24i/^ inch continuous doorway has 

 a frame of 3 inch by 3 inch by 3-16 angle iron. (See Figs. 25 and 26.) 

 Braces of 14 by 1^2 inch iron are bolted to the opposite angles and at 

 intervals of 33 inches fall under the hoops, as did the wood pieces 

 described in the Parish silo. This frame is set to receive in the angles 

 of the frame the inner corners of the blocks bounding the doorway and 

 gives to the doorway both strength and durability. The plaster applied 

 on the completion of the Avail is reduced in thickness, next the door- 

 way, to that of the angle iron. 



Mr. Schipper's silo is covered by a shingle roof. Fig. 28 gives a clear 

 idea of the roof. 



The blocks for Mr. Schipper's silo were made by himself but he hired 

 the labor to build them into the wall. He estimates that the silo com- 

 plete cost him about flSO.OO. 



