84 



EEPOET OF COMMISSIONER OF FISH AND FISHEEIES. 



[301 



Synopsis of the steam, log for the year ending Decemher 31, 1881. 



Stroke of piston, in feet 2i 



Number of cou(Ien.sing cylinders 2 



Diameter of coudeusiug cylinders, in inches 22 



Mean point of steam cut-oif from commencement of stroke of piston, 



in iuclies 6. 75 



Mean number of boles of the throttle valve, open 3. 39 



Mean vacuum in condenser, in inches of mercury 24. 02 



Mean steam pressure in boilers while engines were in operation 26 



Mean temperature of engine room 92.4 



Mean temperature on deck 60. 1 



Mean temperature of injection water 64.9 



Mean temperature of discharge water — 95. 8 



Mean temperature of feed water 83. 9 



Total time fires were lighted, in hours and minutes 4, 685 25 



Total time tires were lighted for hatchings, in hours and minutes.. 1,433 00 



Total time engines were in operation in hours and minutes 778 50 



Total time engines were in operation for dredging, in hours and min- 

 utes 121 09 



Total number of revolutions of starboard engine 3,126,099 



Total number of revolutions of port engine 3,272,441 



Mean number of revolutions per minute en route 81. 7 



Mean piston speed, in feet per minute 387, 65 



Total number of knots run 5,029.5 



Mean n umber of knots per hour 6. 46 



Mean number of knots per hour en route 8. 4 



Total weightof coal consumed for engineer department 473-^440" 



Total weight of coal consumed while engines were in operation 237^'./4%- 



Total amount of coal consumed for galley 24^^4% 



Total weight of refuse 83^tig 



Mean number of pounds of coal consumed per hour while engines 



were in operation 692 



Total number of gallons of oil consumed 364. 75 



Total number pounds of tallow consumed 138 



Total number of pounds of wiping stnft' consumed 199 



Mean draught forward, in feet and inches • 7 feet 3| inches. 



Mean draught aft, in feet and inches 7 feet 7 inches. 



Number of screws 2 



Kind of screws true. 



Mean pitch of screws, in feet and inches 12 feet 3 inches. 



Diameter of screws, in feet and inches 6 feet 8 inches. 



Length of screws, in inches, parallel to axis 20 inches. 



Number of blades 4 



Maximum indicated horse power 222. 92 



Mean indicated horse power 172. 85 



Mean number of ponuds of coal per horse power 3. 9 



Maximum number of pounds of coal per square foot of grate 15 



Mean number of pounds of coal per square foot of grate 12. 7 



Maximum speed attained, under steam alone, in knots per hour 10.33 



Number of hours maintained 5 



Slip of screws at maximum speed, in per cent 9. 4 



State of tide and sea favorable and smooth. 



Mean slip of screws, in per cent 14.9 



Table of distances made under steam by the United States Fish Commission Steamer Fish 



Hawk, for the year 1881. 



