Plate 1 — I ntcnor of respiration chamber for steers and cows 



The shutter between the chamber and the small compartment attached to the front of it 

 is raised, and the feed box has been moved into the latter. The water trough is attached 

 to the right of the frame enclosing the feed box. The iron pipes protecting the side wall 

 of the chamber are made from stock material used by plumbers. The chain attached to 

 the left of the stanchion is used to force the animal to remain in a standing position. The 

 free end of the chain is attached to a wire cable which can be rolled up by a pulley (ma- 

 nipulated outside the chamber wall), thus raising the loop formed at the bottom until it 

 reaches the throat of the animal. The stanchion is of the adjustable form so that ani- 

 mals of different body length will be forced to stand with their hind feet near the grid, 

 which is seen in the foreground. The tube attached vertically to the post on the right is 

 the device used to signal when the animal lies down or rises. A weight sliding up and 

 down within this tube is connected by means of a heavy cord to a belt around the chest of 

 the animal. As the weight thus slides up or down it connects momentary contact and 

 thus forms a circuit for a small dry cell battery which rings a bell. The two chains, one 

 on each side, attached to the front of the floor platform operate the pneumograph which 

 records the activitv of the animal. 



