ARTIFICIAL RESPIRATION MACHINE 



475 



From tank 



Negative pressure Positive pressure 



Fig. 363. Diagram showing the method of operation of the lever gate reversing valves. 



Faucet for 

 constant 

 pressure or 

 vacuum 



Gauges 



Reversing valves (Lever gate valves) 

 Worm gears 

 Tube to operating tables 



-Interrupting valve 



Cone pulley 



Round belt 

 (Interchangeable) 



Cone pulley 

 Air pump 



Connection 

 for power 



Fig. 364. Portable artificial respiration machine. Based on the principles illustrated 

 in Fig. 360. There are several varieties of cheap, small-sized rotary pumps on the market. 

 For a small portable machine like this for research purposes these small pumps are 

 sufficient. The special interrupting valve turned by worm gears is shown better in 

 Fig. 366. 



