654	NICHOLLS'S   SEAMANSHIP   AND   NAUTICAL  KNOWLEDGE
6. Name and sketch the rolled sections used as ship's beams.
6.	A vessel of 1600 tons displacement; centre of buoyancy 8 feet above
the keel; centre of gravity 10 feet above the keel; transverse
metacentre 11'5 feet above the keel Find the angle of heel if a
weight of 8 tons is moved 20 feet across the deck.
7.	When and by whom are ships surveyed for re-classification $
Paper 4.
 1.	Describe how a stem bar is connected to a flat plate keel.
 2.	Sketch a stern frame and name its several parts.
 3.	What are half beams ?    How, and to what are their inner ends
connected.
4.	Name the  components which contribute longitudinal strength to
the ship.
 5.	Draw a figure to illustrate a vessel in unstable equilibrium.
 6.	What  effect on a ship's  stability has slack water  in   a double
bottom tank ?
7.	What is a stealer I
Paper 5.
1.	What is meant by the "centre of pressure" of a rudder and where
about is it situated?
 2.	How is the thrust of the propeller communicated to the hull ?
 3.	Sketch and describe the construction of a cellular double bottom*
 4.	What are the advantages of having longitudinal bulkheads in cargo
spaces ?
5.	Define "coefficient of fineness," and find ship's coefficient, having
given, length 400 ft.; breadth 42 ft.; draft 21 ft. in S.W.; dis-
placement tonnage 7640 tons.
6.	Does corrosion take place more rapidly on the inside or outside of a
vessel?    Give reasons.
7.	Explain how a curve of stability is constructed.
Paper 6.
1.	Are solid 'floors always fitted at every frame in a cellular double
bottom ship ?   If not, what is the alternative arrangement ?
2.	How are a web frame and a stringer tuaited at their crossings 1