Show HOW TO BUILD A SILO The first silos as we have seen were simple pita dug in the ground and the soil thrown out was need to cover and protect the enailage In many soils these pita eryed but A temporary purpose and the next step in their development was a lining of masonry to give the pits a permanent per-manent character From difficulty of keepiqg the water out of these pits in many localities silos of masonry were made above ground and these at first were massive and expensive Tbe next step iu advance wbiob naturally nat-urally followed was to substitute a moveable cover of boards with weights to give the required pressure for tha cover of earth which had been used in the leas perfect form of the silo As an airtight inclosure was found to be the essential condition in the conatruction of a silolighter walls were made aa a matter of economy with good results and even frames of timberlined with boards or planks were substiuted for the more expensive expen-sive structures with complete BUG ness A balloonframe of scantling of suitable size covered on the outside with ached boatdaand lined on the inside with two thicknesses of one inch matched boards with a layer of tarred paper between them thus securing se-curing a practically airtight inoloa ure surrounded by a deadair space asa as-a protection against frost is in the opinion of the writer the beat and cheapen form of construction If the boards and tlmberejare saturated with hot coaltar which can readily be done with trifling expense the durability dura-bility of the ailo will be very muoh increased in-creased From the fact that wood is not so good a conductor of heat as walls of masonry it will be seen from what follows that wooden silos may have an important advantage over any others in preserving the ensilage which in connection with the saving expense in heir construe tion must have an influence in bringing them into general use Popular Science Monthly |