668 NICHOLLS'S SEAMANSHIP AND NAUTICAL KNOWLEDGE
5. Name the several components of (a) the transverse framing;
(6) the longitudinal framing.
6. What are "strum" boxes and what precautions must be taken
with them1?
7. Two hundred iron tanks 3 ft. x 3 ft. X 2 ft. 6 ins. are stowed
when empty in No. 3 hold, the ship's mean draught being then
18 ft. 6 ins. The tanks were then filled with beans in bulk at
48 cubic feet per ton. What will the mean draught be when the
tanks are filled, the ship's T.P.I, being 35?
8. Find the total load on a double purchase and the pull on the
hauling part of the fall when rove to advantage and lifting 20
cwt. .State what allowance, if any, you have made for friction.
Paper 2.
1. How is the density of sea water ascertained ? Distinguish between
"'density " and "specific gravity."
2. A cargo of grain in bags has just been discharged, describe fully how
you.would prepare the holds and be ready to load a general cargo.
3. A vessel at a mean draught of 14 feet has a deadweight of 1372 tons
and at 15 feet mean draught her deadweight is 1588 tons. If the
vessel has a mean draught of 14 ft. 6 ins. and loads an extra 50
tons, what would be her new mean draught, and what deadweight
would she then have on board ?
4. Sketch (a) a lap joint; (6) a butt strap joint.
5. What are the advantages and disadvantages of the "joggled" and
the "out and in " systems of plating? Illustrate by sketches.
6. What are " crutches " and " panting beams'J ?
7. Assuming the righting levers (GZ's) of a ship at 10° heel to be *5 ft.;
at 20% 1-1 ft.; at 30% 1*6 ft.; at 40°, 1*95 ft.; at 50% 1'7 ft,;
at 60% 11 ft.; at 65% *5 ft: construct a graph and from it find
the righting arm at 25°, also the " range" of the ship's stability.
8. A caisson when filled with ballast weighs 10 tons and measures 200
cubic feet. What weight will be on the crane when the caisson is
lowered into sea water?
9. A derrick is at an angle of 40° from a vertical mast A weight of
10 tons is being lifted with a guntackle purchase, the hauling part
leading from the upper block down the derrick to a winch at the
heel of the derrick. Find the stress on the shackle at the derrick
Kead, allowing one-tenth for friction at