re, to contain the lading.

HOPPO. The chief of the customs in China.

HOPPO-MEN. Chinese custom-house officers.

HORARY ANGLE. The apparent time by the sun, or the sidereal time of the
moon, or planets, or stars, from the meridian.

HORARY MOTION. The march or movement of any heavenly body in the space
of an hour.

HORARY TABLES. Tables for facilitating the determination of horary
angles.

HORIE-GOOSE. A northern name for the _Anser bernicla_, or brent-goose.

HORIOLAE. Small fishing-boats of the ancients.

HORIZON. The apparent or visible circle which bounds our vision at sea;
it is that line which is described by the sky and water appearing to
meet. This is designated as the _sensible_ horizon; the _rational_, or
_true_ one, being a great circle of the heavens, parallel to the
sensible horizon, but passing through the centre of the earth.

HORIZON-GLASSES. Two small speculums on one of the radii of a quadrant
or sextant; the one half of the fore horizon-glass is silvered, while
the other half is transparent, in order that an object may be seen
directly through it: the back horizon-glass is silvered above and below,
but in the middle there is a transparent stripe through which the
horizon can be seen.

HORIZONTAL. A direction parallel to the horizon, or what is commonly
termed lying flat. One of the greatest inconveniences navigators have to
struggle with is the frequent want of a distinct sight of the horizon.
To obviate this a _horizontal spinning speculum_ was adopted by Mr.
Lerson, who was lost in the _Victory_ man-of-war, in which ship he was
sent out to make trial of his instrument. This was afterwards improved
by Smeaton, and consists of a well-polished metal speculum about 3-1/2
inches in diameter, inclosed within a circular rim of brass, so fitted
that the centre of gravity of the whole shall fall near the point on
which it spins. This is the end of a steel axis running through the
centre of the speculum, above which it finishes in a square for the
convenience of fitting a roller on it, bearing a piece of tape wound
round it. The cup in which it spins is made of agate flint, or other
hard substance. Sextants, with spirit-levels attached, have latterly
been used, as well as Becher's horizon; but great dexterity is demanded
for anything like an approximation to the truth; wherefore this
continues to be a great desideratum in navigation.

HORIZONTAL FIRE. From artillery, is that in which the piece i