THE ALTEKKATE AND PARALLEL SYSTEMS. 



217 



mm w\w\\\\\W 



FIG. 107. SPIRAL, SPRING. 



The tilt boxes are placed with the under surfaces of 

 their floors 2 1-2 ft. higher than the floor of the passage, 

 and are 2 1-4 ft. high, with bottoms 3 1-2 it.xG ft., the 

 G ft. distance being parallel to the passage. The sta- 

 tionary box serves as a roost and is 5 ft. 3 in.x3 ft., the 

 3 ft. distance being parallel to the passage. The floor of 

 the stationary box is 8 in. higher than the floor of the 



tilt box, to allow for the depth 

 of the litter in the latter. The 

 posts which support the tilt 

 boxes, stationary boxes and 

 feed cylinders, see a and d in 

 Figs. 77, 129 and 130, and a and c in Figs. 129 and 130, 

 extend from the floor of the building to the roof. 



Passing now to a consideration of the indoor exerciser 

 on the parallel plan, the reader is asked to turn to Fig. 

 132, representing a perspective of a house for layers or a 

 section of it, enough to show the idea, Fig. 117 being a 

 transverse section of the same, Fig. 118 a longitudinal 

 section, and Fig. 135 a ground plan, the same letters in 

 each of these four referring to the same things. The 

 parallel system is preferable in some important respects 

 to the alternate system just described. 



The elevation, 

 Fig. 132, needs little 

 description, and we 

 call attention only to 

 the windows, which, 

 as will be observed, 

 are slanting when closed, as explained in the case of the 

 building previously described. In ordinary windows, the 

 sash are made smaller than the window frames, the latter 

 enclosing the former. But when a large number of win- 

 dows are to be raised or lowered simultaneously in a 

 building, the sash should be larger than the window 

 frames and the former should overlap the latter so that 



FIG. 108. TOP VIEW OF SIEVE. 



