672 NICHOLLS'S SEAMANSHIP AND NAUTICAL KNOWLEDGE
9. Construct a displacement curve for the following*—
Displacement tons 334 1020 1950 2930 3830 4840
Draught 2' 6" 5' 0" 7' 6" 10' 0" 12' 6" 15' 0"
Find draughts corresponding to 2340 and 4500 tons displacement.
Using above curve if the vessel started loading at 7' 6" draught
and while loading she pumped out 510 tons ballast, find the cargo
loaded if she completes loading at 15 feet draught,
Paper 8.
1. How would you tally a general cargo and what would you note in
the tally book?
2. How do you stow a riding tier of barrels? How high do you stow
barrels, hogsheads, puncheons, butts? State the capacity of
each in gallons.
3. Describe the construction of a grain feeder used when loading gram
in bulk. What percentage of the cargo should it contain?
4. How and where are explosives stowed? What precautions are
taken when loading?
5. A hold having a capacity of 36,218 cub. ft. has stowed in it 212
tons of steel. The remainder of the space contains 626 tons of
coal stowing at 45 cub. ft. Find the stowage of the steel in cub. ft.
per ton.
6 Sketch and describe a single plate rudder.
7 What is the angle of maximum efficiency of the rudder and what
prevents it going over too far?
8. A homogeneous log 8' long and 18" diameter floats half submerged
in F.W., find weight of the log.
9 Construct a T.P.L 'curve from the following data:—
Draughts 2 ft. 5 ft. 8 ft. 11 ft. 14 ft.
T.P.L 8 13-5 16-2 17-7 18-5
Find T.P.I for draughts 7, 12 and 13 feet.
At a draught of 10 feet the vessel takes on board 25 tons F.W.,
find her new draught.
Paper 9.
1. How is cargo prevented from touching the ship's side while loading,
and what additional precautions are taken when loading rice or
a similar cargo?