BUILDINGS 



put on horizontally and can be used more economically in 

 this way, though sometimes in order to get a different effect 

 it is put on diagonally. This, however, gives a longer un- 

 supported section of the board and is not to be especially 

 recommended in deep cribs. 



Roofs. Most crib roofs have the ordinary construction 

 of rafters, sheathing and shingles. This makes a very de- 

 sirable type of roof since it gives excellent protection to the 

 grain and since the roof itself will be more than ordinarily 

 durable, for the pitch of the roofs on cribs is generally at 

 least one-half. The purpose of using a steep pitch on roofs 

 of grain storage buildings is to provide room for the instal- 

 lation of conveyor equipment in the upper part of the crib. 

 The mistake should not be made, as is quite commonly done, 

 of assuming that the roof will help hold the crib together. 

 Its sole purpose should be to shelter the enclosed grain and 

 the framing of the crib should be made strong enough to 

 support itself and any load which is likely to come upon it. 



General Arrangement. The labor of handling grain has 

 become almost entirely mechanical. Formerly the height of 

 the building was governed by the height to which a man 

 could shovel grain, and on account of the labor and difficulty 

 involved, cribs were seldom built over 12 feet high. The 

 advent of the modern portable dump and elevator, manu- 

 factured in such a multitude of variations for both inside 

 and outside installations, makes it possible to have bins 20 

 feet or more in height and still permit the filling of the bins 

 to be accomplished with a minimum of manual labor. 



In general arrangement the gradual evolution of the 

 grain storage building which has occurred on the general 

 purpose farms throughout the country has shown that the 

 best type of construction is the double form, i. e., two rows 

 of bins with a central driveway between. Of course, on 

 small farms, and occasionally on large ones, granaries are 

 sometimes constructed as small, single, separate buildings. 

 Where a considerable amount of grain is produced, however, 

 the first mentioned type is more generally to be found. In 

 this general type the corn bins, if any, are located at the 

 sides of the driveway, the driveway being made from 9 to 

 14 feet wide and with an overhead clearance of at least 9 feet 

 which will give room enough for a loaded wagon and a 



Seven 



