22 



serious of tlie irregularities noted. It is possible tliat the improved 

 Goff apparatus points out tlie necessary conditions to overcome the 

 existing- defects. Jt would also be of advantage if by means of some 

 form of index the height of the Avater and oil could be more readily 

 determined at any time. 



EXPERIMENTS WITH PITMP. 



The apparatus was charged with kerosene and water, the gange fixed at -^K- (6f per 

 cent), and the liquid si^rayed into a vessel until the mixture ran whitish. 



Tubes 1 and 2 were then filled without intermission. After the lapse of three miu- 

 utes tubes 3 and 4 were filled without intermission. 



The gauge was then fixed at it,- (20 per cent) and the pumping continued until a 

 uniform mixture came Ixom the nozzle, Avhen tubes 5 and 6 were filled without inter- 

 mission, and after a lapse of three minutes tubes 7 and 8 were filled. 



The gauge was left open during the three-minute intervals between experiments 

 2 and 3, 6 and 7. 



More or less oil having entered the water reservoir, the oil was shut off and the 

 pump thoroughly cleaned and refilled. 



The gauge was again placed at -i-,,-, and after pumping for a sufficient interval the 

 oil was shut oil" for one minute and promptly stopped. Tubes 9 to 12, inclusive, Aveve 

 filled, with an intermission of one minute between fillings, during which the oil was 

 shut otf and pun)ping suspended. 



The pump was then cleaned, refilled, charged at f-,-i, and operated until ihe normal 

 mixture came from the nozzle. The oil was shut off, pumping suspended i'or about 

 two minutes, and then tubes 13 to 16, inclusive, filled one after another continuously. 



To further test the accuracy of the gauge indications, a series of samples was taken 

 at the difterent grades indicated. After the change from one mark on the gauge to 

 another the jiumping was continued to another A^essel for a time sufficient to get the 

 normal mixture at the nozzle. 



The following results were obtained : 



No. 



Per cent of oil 



indicated by 



gauge. 



Per cent of oil 

 actually obtained. 











j 



First 



Second 





Gauge. 



Per cent. 



experi- 



experi- 









ment. 



ment. 



1 



i 



8 



1^ 

 1\ 





2 





3 



6| 



'2h 







4 



tV 



63 



H 







5 



s 



20 



IGV 





6 



90 



10" 







1 20 

 -^ 20 



23 





8 



18 







9 



r« 20 



12i 





10 



-^ 20 

 T% i 20 



T% ! 20 



13 





11 



12i 

 13 





i2 







13 



"- 20 



10 





14 



2' 20 





15 

 16 



li 20 



i", ! 20 



10 

 10 









17 



ill 



50 



60 



53 



18 



1% 



40 



45 



41 



19 



z% 



30 



24 



23 



20 



T% 



20 



16| 



13 



21 



iV 



10 



7| 



6i 



22 



tV 



6f 



5 



5| 



23 



-^ 



3i 



2 



i 



