PAPERS ON PHYSICS 



311 



TABLE II. 

 Cenco-Hyvac Oil Pump No. 



13 liter volume 

 RP.M Equals 224 



Pressure 



Time in in mm. 



Minutes Mercury- 



25 01260 



30 004S0 



35 00154 



40 00084 



45 00065 



50 00060 



55 00057 



65 00056 



85 00056 



105 00055 



505 00037 



6 liter volume 

 RPM Equals 214 



Pressure 



Time in in mm. 



Minutes Mercurv 



15 00564 



17.5 00210 



20 00132 



22.5 00093 



25 00076 



27.5 00073 



30 .00070 



35 00067 



40 00065 



45 00062 



55 00058 



65 00053 



75 00051 



85 00050 



A 186 



1.3 liter volume 

 RPM Equals 230 



Pressure 

 Time in in mm. 



Minutes Mercury 



4 00832 



6 00279 



8 00165 



10 00124 



12 00095 



17 00079 



22 00062 



27 00051 



Readings were taken at five or ten minute intervals over a 

 period of several hours. The revolutions per minute of the 

 pump were also noted from time to time. 



■Olio 



0/10 



O'oo 



^ OOC?0 



o 



u ooao 

 u 



^ OOTo 



. doio 



Jj .0030 

 5 00 io 



FIG. 2. 



After completing the run with the 13 liter volume it was 

 replaced by a glass tube of about 3.5 cm. diameter, making 

 the total volume now to be exhausted but 1.3 liters, — 



