86 AN EGG FARM. 



there are four small yards, there are, of course, sixteen 

 gates in all, each being two by two feet. The four gates 

 of each group, G, G, Gf, G, are opened and closed as one 

 gate, by means of a wire, starting from one operating 

 room, m, and running the whole length of the main 

 building to the opposite operating room. The farthest 

 gate in a group is thirty-three feet from the main build- 

 ing. The gates are pivoted, transom fashion, and are 

 perpendicular when closed, as at G in Fig. 30 and at G 

 in Fig. 28, and horizontal while open. They have a 

 common pivot, consisting of a shaft of iron pipe, to 

 which they are fastened in such fashion that they turn 



D 



FIG. 30. GATK FOK COVKKKD YARDS. 



with it, not on it. The shaft extends into the operating 

 room a few inches, where is attached a strong spoke or 

 arm, three feet long, and to this arm is fastened the 

 wire above described. By taking hold of the arm itself, 

 if you are at the nearest room, or by means of the wire 

 if you are at the distant room, the shaft is caused to 

 make one-quarter of a complete revolution, which is all 

 that is required to open the gates. They are made so as 

 to close by gravity when released, and when shut they 

 come to rest over the bottom fence rail, D. A board, 

 B, runs the whole length of yard, y, and rests on the 

 gates. See B in Fig. 30, and compare with the trans- 



