The product will give approximately the cubical contents of the ship,
and the general tonnage can be ascertained by dividing bv 100 or by
2.83, according as the measurements are taken in Englisn feet or in
meters.
Art. 10. If there be a break, a poop, or other permanent covered
and closed-in spaces (as defined m the general principles) on the
upper deck, the tonni^e of such spaces shful be ascertained by multi-
plying together the mean length, breadth, and depth of such spaces
and mvi(ung the product by 100 or 2.83, according as the measure-
ments are taken in Englisn feet or meters, and the quotients so



SUEZ CANAL MEASUREMENT. 65

obtained shall be deemed to be the tonnage of such space, and shall
be added to the other tonnage in order to determine the gross tonnage
or total capacity of the ship.
DEDUCTIONS ^ TO BE MADE FROM THE GROSS TONNAGE IN ORDER TO

ASCERTAIN THE NET TONNAGE.
Art. 11. To find from the gross tonnage of vessels as above set
forth the official or net register tonnage, either for sailing vessels
or for steamships, the following mode of operation must be resorted to.
SAILING VESSELS.
Art. 12, For sailing vessels deduct the spaces exclusively and
entirely occupied by the crew and the ship's officers, those taken up
by the cookhouse and latrines exclusively used by the ship's officers
and crew, whether they be situated above or below the upper deck;
the covered and closed-in spaces, if there be any situated on the
upper deck, and used for working the helm, the capstan, the anchor
gear, and for keeping the charts, signals, and other instruments of
navigation.
