FOR SITTERS IX MILD CLIMATES. 79 



treadle rod, but Fig. 20, being designed only to show the 

 working, is not an exact representation of the nest and 

 the passage to the nest, there being in reality a liberal 

 employment of wirework in top and sides of these for 

 the sake of air. 



Now, as there are 144 nests in a horizontal row or 

 tier, each with its passage, door, treadle, and other 

 parts; to set all these traps by hand, in other words, to 

 go through the alley and depress each door-bar singly to 

 make each engage with its catch, would take too much 

 time. A trap-setter must be employed to set them all 

 at once, or as many as are in use for hatching purposes. 

 An iron shaft, I, in Fig. 25, and also / in Fig. 26, con- 

 sisting of a common 3-4 in. water pipe, extends the 

 whole length of the row of nests, a transverse section of 

 tins shaft being shown also at I, Fig. 29. The shaft has 

 bearings made by driving staples into a 2x6 stick, 

 attached immovably to the building. To the shaft, at 

 intervals of 1 ft., corresponding to the width of the 

 nests, are attached arms of large wire, each 11 in. long, 

 with a loop or an eye in the end farthest from the shaft, 

 as at 1 in Fig. 25, to which the cord, a 1 , is fastened, a 

 small snap hook being tied permanently to the cord and 

 snapped into the eye. This cord passes over the pulley, 

 p, and is fastened to the door, 7i. It will be readily seen 

 that when the shaft, ?, has been turned, ty means of a 

 lever at either end of the building, operated by the atten- 

 dant, so as to throw the arm to the point 1, as shown in 

 Fig. 25, the door is raised to the first position (and, of 

 course, all the doors in the tier, attached by cords in the 

 same way, are brought to the first position) and all the 

 sitters are able to enter the nests, their daily run out of 

 doors being finished. Having set all the traps, the shaft 

 is turned to bring the arm to the point 2, so that the 

 cords may be slack, permitting each hen to drop her 

 own door. 



