32 REPORT OF COMMISSIONER OF FISH AND FISHERIES. [30] 



Number of screws 2 



Kind of screws True. 



Mean pitch of screw, in feet and inches 12.3 



Diameter of screw, in feet and inches 6.8 



Length of screw, in inches, parallel to axis 20 



Number of blades on each screw 4 



Maximum indicated horse-power 277 



Mean indicated horse-power 252. 7 



Mean number of pounds of coal per horse-power 2.21 



Maximum number of pounds of coal per square foot of grate 13.9 



Mean number of pounds of coal per square foot of grate 12. 8 



Maximum speed attained under steam alone in knots per hour 10 



Number of hours maintained 5. 30 



Slip of screw at maximum speed, in per cent 12 



State of tide and sea Smooth. 



Mean slip of screw, in per cent, en route 19.57 



