CIRCULATION. 99 



(2) Attach a wide capillary and repeat. What is the 

 character of the stream? 



(3) Attach a fine capillary and repeat. Note the 

 results. 



/;. Intermittent force and elastic tubes. 



(4) Disjoin the glass tubing from the bulb and join 

 the elastic tube. Work the bulb as directed above, 

 and observe the character of the flow. 



(5) Join on the coarse capillary and repeat, noting 

 the change. 



(6) Replace the coarse capillary with the fine capil- 

 lary and repeat. Sum up the results and formulate 

 conclusions. 



c. Quantitative tests. 



(7) How much water will be ejected through a fine 

 capillary tube in ten seconds in experiment (3) ? 



(8) How much through a fine capillary in the same 

 time in experiment (6). 



NOTE: In performing experiments (7) and (8) great 

 care should be used to exert exactly the same force 

 upon the bulb. The same capillary should be used in 

 the two experiments. 



What is the significance of these two experiments? 

 b. The impulse wave. The graphic record. 

 /. Appliances. Support; cork board (about 8 by 10cm.); 

 small glass rod about 20 cm. long; corks; needles; 

 kymograph; piece of sheet lead 1 cm. wide and 5 cm. 

 long; copper wire No. 16. 



2. Preparation. Make a tracing lever from the glass 

 rod by drawing out one end to a rather fine point 

 and drawing the other to about one-half its original 

 diameter and bending it to make an angle of 135. 

 Bend up 1.5 cm. of each end of the sheet lead so that it 

 will stand at right; angles to the rnicHle 2 centimeters; 



