MATERIAL. 



Many kinds of material have at different times been used in the con- 

 struction of silos : ainon^ them, stone, cement, lumber, brick, tile, sheet iron, 

 galvanized iron. etc. We need consider only cement and lumber, the two the 

 most readily available throughout our Province, and everywhere the best 

 suited to this purpose. 



CONCRETE SILOS. 



Concrete silos are of three types : 

 (1.) Monolithic or solid wall: 

 (2.) Monolithic hollow wall: 

 (3.) Concrete block. 

 Of these, the solid-wall concrete silo 

 constructed, and will be dealt with herein, 

 walls, without reinforcement. By means 



is the cheapest and most easily 

 It was first built with very thick 

 of reinforcement bars, wire, or 



wire mesh embedded in the concrete, a much greater strength can be obtained 

 with thinner walls. This effects a considerable saving in the quantity of 

 cement used and in the cost of material and labour. 



FORMS. 



Clean a space on a barn-floor, then secure a long piece of 1-inch by 3-inch 

 material. Nail one end to the floor, and from the centre of the nail measure 

 out on the strip the exact distance of the radius of the silo to be built. 



(Fig. 2.) Showing method of laying out forms. 



