[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 coudeused water by a "erowu meter'' and verified it by 

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



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



Duration of the experiment, iu hours 12. 



Cubie feet of water coudeused from the exhaust 96.75 



P=Absolutc steam pressure, mean, per square iuch, iu 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, iu square feet 0. 0027*266 



V=Velocity of the steam, iu feet, per seeond( — m , — J 332. iJ 



( -' J16 =^ 

 V^. 0027266 J 



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



«=Weigbt of steam 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. 



UWVelocity of the vanes ("buckets"), in feet; per second 74.3944 



W=Work done. 



Then 



W = *°(V 2 -U 2 ) (2) 



2</ 



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

 power. 



rj _2*RN 

 60 



and 



w=VAWi =.13S08 pounds of steam per second. . . (3) 



Substituting iu equation (2) we have 



•!5°?(332.2 2 — 74.3944 2 )=. 00216 (110356.84- 5533.87) 



226 417 

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



550 



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



/96 75 \ 

 of water condensed per hour was i ' — ) 8.0625 cubic feet. Conse- 

 quently, the weight of water per horse-power per hour was 



^ 8.0625x62.07 = ^ 1220 . 6 pounds . 



During the entire experiment the two throttles on the motor were 

 kept wide open. 

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



