the Flow of Air through a Pipe. 

 Table III. 



395 



Expt. 



Pipe. 



lbs. per sq. in. 



I'm, 



ft. per sec. 



42 

 363 

 269 

 395 

 321 

 233 



Length, Diam. 

 ft, ft. 



1 

 Pv 1'.- 



pm. 



dp. 



la 



2a 



3a 



4« 



5 a 



6a 



103 



•5625 

 •5433 

 •5271 

 •5625 

 •5433 

 •5271 



1474 

 1475 

 14-75 

 1473 

 14-74 

 1474 



14-7 

 14-7 

 147 

 147 

 147 

 14-7 



1472 

 14-72 

 14-72 

 1472 

 1472 

 1472 



•0439 

 •0475 

 0526 

 •0340 

 •0395 

 0440 



(4) Experiments by Dr. Brix (Proc. Inst. C. E. vol. xliii. 

 p. 181) on a lead pipe 025 in. ('02083 ft.) diameter and 

 358*5 ft. long. The mean pressure ranged from atmospheric 

 to 17*4 lbs. absolute per sq. in., and the mean velocity from 

 12*3 to 28*7 ft. per sec. In these experiments the tempe- 

 rature is unknown, but was probably about 65° F. 



Table IV. 





Pi 



pe. 





lbs. per 



sq. in. 







Expt. 















ft. per sec. 



Length, 



Diam. 









ty- 





ft". 



ft. 



Pv 



p.,. 







lb 



358-5 



•02083 



1779 



1470 



10-25 



309 



204 



2b 







' 18-18 





1644 



3-4S 



220 



2,b 







18-57 





16-63 



3-87 



23-5 



4b 







1896 



. 



1683 



4-20 



25-0 



5b 







19-34 





17-02 



4-64 



263 



6/; 







19-73 



fJ 



1721 



503 27-5 



7 b 







2012 





17-41 



5-42 



28-7 



8b 







15-35 



1405 



14 70 



1-30 



12-3 



9b 





?i 



15-67 



13*73 





194 



163 



10b 







15-86 



1354 





2-32 



Ls-4 



11 A 







1625 



13-15 



- 



310 



22-3 



(5) Experiments by Dr. Grindley and the author on a 

 lead pipe -12761 in. (-01063 ft.) diameter and 108*8 ft. long, 

 and by the author on a series of lend pipes '1248 in. ("0104 ft.) 

 diameter and of lengths ranging from 37*2 to 108'8 ft. 



In these experiments the mean pressure varied from 14*0 

 to 17 '4 lbs. per sq. inch absolute, the mean velocity from 6*0 

 to 43*0 ft. per second, and the temperature was varied as 



required 



betwe 



en 6 



2° ¥. and 212° F. 



