CHAPTER XXII. 



PERFECTING THE DETAILS. 



The axle for a row of feed cylinders may be made 

 from iron pipe, half inch diameter, if the row is not 

 over 150 ft. in length, and as the pressure of the weight 

 of the grain in the cylinders tends to hold the lengths 

 of pipe together, there is no danger of unscrewing. 

 But, as in case of the tilt boxes, there is sometimes pres- 

 sure, tending to unscrew the lengths of pipe, a collar, 

 consisting of a short piece of larger pipe, should be 

 slipped over the end of each length of pipe at the joint, 

 this collar to be bolted to the pipe. Let a, a, in Fig. 

 87, represent each the end of a length of pipe, meeting 

 at the joint, e. The collar, 6% encloses the end of each 

 pipe, being held in place by the bolts, i, i, which pass 

 through holes drilled through both the collar and the 

 pipes. For brooder chicks' tilt boxes, three-fourths inch 

 pipe will answer for the axle, and no collars will be nec- 

 essary unless the row of tilt boxes exceeds 1 50 ft. in 

 length. 



For axles to tilt boxes of grown fowls, the pipe should 

 be two inches in diameter, and the collars may be omit- 

 ted if the line of tilt boxes is less than 50 ft. in length. 

 When operations are begun on a small scale, it will fre- 

 quently happen that it is more convenient to use wooden 

 axles for the tilt boxes, like Fig. 74, revolved by means 

 of a long wooden lever, Fig. 88. To prevent a very 

 disagreeable creaking, which frightens the birds, as well 

 as annoys their owner, when such wooden axles are 

 made to turn, fasten strips of tin under the axles at the 



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