4. Moderate breeze { with all sail set, and } 5 to 6 knots.
{ clean full, would go in }
{ smooth water, from }
5. Fresh breeze } { Royals, &c.
6. Strong breeze } { Single-reefed top-sails
} { and top-gallant
} or that in which such a { sails.
7. Moderate gale } ship could just carry in { Double-reefed
} chase full and by { topsails, jib, &c.
8. Fresh gale } { Triple-reefed
} { topsails, &c.
9. Strong gale } { Close-reefed top-sails
} { and courses.

10. Whole gale or that with which she could scarcely bear
close-reefed main topsail and reefed foresail.
11. Storm or that which reduces her to storm staysails.
12. Hurricane or that which no canvas could withstand.

_Corrections._--As soon after the observations have been made as
circumstances will permit, the reading of the barometer should be
_corrected_ for the relation existing between the capacities of the tube
and cistern (if its construction be such as to require that correction),
and for the capillary action of the tube; and then _reduced_ to the
standard temperature of 32° Fahr., and to the sea-level, if on
shipboard. For the first correction the _neutral point_ should be marked
upon each instrument. It is that particular height which, in its
construction, has been actually measured from the surface of the mercury
in the cistern, and indicated by the scale. In general the mercury will
stand either above or below the neutral point; if _above_, a portion of