ON STEAMSHIP PERFORMANCE. 
991 
_ tween the Cloch and Cumbrae lights, a measured distance of 13-66 knots, 
which she accomplished in 61 minutes 50 seconds, equal to a speed of 13-25 
knots per hour; revolutions from 47 to 50 per minute, with a steam-pres- 
sure in boilers varying from 26 to 29 Ibs. per square inch, Draught of water 
being 201 ft. 
Consumption of Coal, §c.—On November 2nd the ‘ Hansa’ was taken out 
again, and the steam kept at a pressure varying from 26 to 29 lbs. per 
Square inch, the revolutions of the engines ranging from 48 to 50 per 
minute; and it was found that 8616 Ibs. of coals, which were weighed 
on deck and lowered to the stoke-hole, kept the steam up at the pressure 
above named for 136 minutes. 
This is equal to a consumption of 3801 lbs. 
of coal per hour, or about 2lbs. per horse-power. The coals used were 
from the best Welsh pits (Aberdare). 
Lhe Temperature of the Steam in the boilers was 272°; 
on leaving super- 
heater, 340°; on entering cylinder, 280°. There being the facility for 
mixing the steam in this case, the steam from three boilers was supplied 
superheated; and the steam from the fourth passed direct to the cylinder. 
This was found to be necessary from the superheated steam being too dry for 
the packing and faces. 
the Appendix. 
The result of this will be seen from the diagrams in 
Feed-water —The temperature of feed-water about 80°, and the water to: 
make good the waste that occurred by blowing off steam, d&c., was supplied 
to the large boilers direct from the sea. 
ENGINEER’s Pocket Loa. 
The following are the particulars asked for in the “ Engineet’s Pocket 
Log” issued by the Committee on Steamship Performance, 
Engines by 
Running between and 
Length of yoyage—knots or statute miles. 
The steamer, 
Built by 
In the year 
Greatest speed under steam alone, in knots 
or statute miles. 
Average duration of voyage, deducting 
stoppages. 
Shortest time in which the voyage has been 
made, 
Longest time taken to perform the voyage. 
Kind of cargo carried. 
Tons of cargo by weight. 
Tons of cargo by measurement. 
Supply of coals taken. 
Is this for the double run? 
Consumption of coals on one voyage. 
Quality of coals used. 
Oil—gallons per 24 hours. 
Tallow—pounds per 24 hours. 
Number of engineers, 
Number of firemen. 
Number of trimmers. 
TABLE OF DISPLACEMENTS AND IMMERSED 
SECTIONS, FROM 1 FT. TO 28 FT, 
Tonnage, builder’s measurement. 
Tonnage, register. 
Weight of engines, 
Weight of boilers without water. 
Weight of water in boilers. 
Weight of screw. 
Weight of screw-shafts, 
Vessel—length over all. 
Beam. 
Depth. 
Length at load-line, . 
Breadth at ditto. 
Draught at ditto. tA 
The mean girth under water, as found by 
taking the mean of the girths, as measured 
on the “ body-plan” of the vessel, of the 
immersed parts of a series of equidistant 
frames or cross sections. 
Length of bows from “ dead flat.” 
Length of stern from “ dead flat.’ 
Numnber.of masts. 
How rigged. 
From top of bulwarks to load water-line, 
Length of engine-room. 
Length of boiler space. 
Length of vessel taken up as coal-holes in 
addition to above. : 
Distance from engine to screw propeller. 
Diameter of screw propellers. 
Average pitch. 
Pitch at circumference. 
Pitch at boss, i 
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