MoLLERS VALVE — IJRUNTON S STOPCOCK. 



2G5 



Tlie alternation may be effected still more rapidly and con- 

 veniently by a stopcock which I have had made for this pur- 

 pose. Two tubes, c and c', pass from its sides, and two others 

 D and d', from its bottom. The interior is perforated witli 

 tln^ee holes. Two of these, E and e', are L-shaped, and one (f) 

 passes straight through from side to side. When the liandle B 

 is in a line with c and c\ their lumen corresponds with that of 



Fig. 130. 



A. Brunlon's rtopcoct. r. jMul'er's ralre. 



the hole r, and air passes straight through. When r. is trans- 

 verse, the hole E corresponds with c and D, and e' with c or d', 

 so that air passing in through c' passes down through d', and 

 may pass up through D and out at c. When B is neither in a 

 line with c nor yet transverse, but half-way between, the holes 

 in the interior do not correspond with those on the exterior of 

 the stopcock, and no air can pass at all, and it may thus be 

 used for experiments on asphyxia. When sucli experiments 

 are made, the hole in the tiacheal cannula must be carefullv 



