P A screw movement to hoist the stern flyers out of gear; and out of water when the vessel is under sail,
M The pumps to force the water out at the pipe R.
The mast descends the sail boom and mast are tied together and made fast to the deck before the operation of plunging commences.
Plate the Second one inch to a foot,
This exhibits a transeverse section A the Valve to let in the the water which rises up to the deck B.B from which to the upper deck all round the Vessel are chambers to hold submarine bombs; which are placed in the chambers through trap doors on deck; and which bombs being the weight of water will in plunging displace their volume of water; and not add to or deminish the weight of the Vessel; this is the best mode of arranging the bombs for were they inside they would be embarrassing and each one when taken out would require to be replaced with its weight of water—
PLATE THE FIFTH
PLATE THE SIXTH
F The pipe to give air,