[41] U. S. FISH COMMISSION STEAMER ALBATROSS. 43 



limits, what power was produced from this. For this purpose the writer 

 connected the exhaust-pipe from the motor with the distilling apparatus, 

 measured the condensed water by a "crown meter" and verified it by 

 measurement in the ship's tanks, where the water was delivered. 



Experiment to determine iHie power and the economy of the fan-motor. 



Duration of the experiment, in hours 12. 



Cubic feet of water condensed from the exhaust 96. 75 



P=:Absolute steam pressure, mean, per square inch, in pounds 63.00 



T=Temperature of the water , 91° 



Relative volume of the steam and water 409. 



Volume of steam, in cubic feet : 39,570. 75 



Cubic feet of steam per second 0. 916 



A=Area of the steam jets, in square feet 0. 0027266 



V:=Velocity of the steam, in feet, per second/ — — = I 332 2 



'^ V,. 0027266 J 



Wi=Weight of a cubic foot of steam at P pressure, in pounds 0. 152445 



tti::=:Weight of stcam per second 0. 13808 



R:=Radius, to center of pressure of the " buckets '' or vanes, in feet ... 1. 2916 



N;=Number of revolutions per minute 550. 



U-= Velocity of the vanes ("buckets"), in feet, per second 74. 3944 



W^Work done. 



Then 



W= |(V^-U^) (2) 



This assumes that the total velocity lost by the steam is utilized in 

 power. 



60 



and 



w=VAWi =.13808 pounds ®f steam per second. . . (3) 



Substituting in equation (2) we have 



:^^?(332.22— 74.39442) =.00216 (110356.84- 5533.87) 



996 417 

 = 226.417 pounds of work per second, or - *" ' - =0.41 horse-power. 



ooU 



A cubic foot of water at T degrees weighs 62.07 pounds ; the volume 

 of water condensed per hour was ( ' = ) 8.0625 cubic feet. Conse- 

 quently, the weight of water ]3er horse-power per hour was • 



/ 8.0625x62.07 \ .oon^ a 



i ^^-^^j = \ 1220.6 pounds. 



During the entire experiment the two throttles on the motor were 

 kept wide open. 

 Though the fan does not run as fast sts expected, the air is changed 



