ADJUSTMENT OF APPARATUS 



165 



points on the drum, recording 1 from above downward, on- 

 cometer, blood-pressure, respiration, base line and time 

 signal. The writing points slwuld not be in a straight line 

 perpendicularly but should be so adjusted that each two 

 adjacent pointers can just pass each other. 



2plre, 



Lea 



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Fig. 159. Arrangement of apparatus for making several records at the same time 

 on the drum. The proper adjustment of these tambours, etc., is one of the most dif- 

 ficult parts of the whole experiment. Suitable stands which can be placed close to- 

 gether at the bottom aid greatly. (See chapter on shop work.) 



4. Start the drum and inject one-half cubic centimeter 

 of adrenaline. Make a small cross just under the position 

 of each record at the moment of injecting the drug. Do 

 you get a satisfactory record? The purpose of this in- 

 jection is to show you what a good spleen or kidney volume 

 tracing should look like. 



Consult the instructor to get his opinion of your record. 



