, and swallow navigation up."

YOKE. A transverse board or metal bar, a substitute for the tiller,
which crosses the head of a boat's rudder, and having two lines
extending from its opposite extremities to the stern-sheets of the boat,
whereby she is steered.

YOKE-LINES. The ropes by which the boat's steerage is managed.

YOUNG. A word often used for uninitiated.--_Young gentlemen_, a general
designation for midshipmen, whatever their age.

YOUNG FLOOD. _See_ FLOOD.

YOUNG ICE. Nearly the same as bay-ice, except that it is only applied to
ice very recently formed, or of the present season.

YOUNGSTER, OR YOUNKER [an old term; from the Anglo-Saxon _junker_]. A
volunteer of the first-class, and a general epithet for a stripling in
the service.

YOUNG WIND. The commencement of the land or sea breeze.

YOU, SIR! The irritating mode in which some officers address the seamen.
The late Lord Collingwood never permitted it.

YOW-YOW. A smaller kind of Chinese sampan.

Y'S OF AN INSTRUMENT. The Y-shaped bearings for the telescope axis, on
the precision of which the value of an astronomical observation much
depends: similar to the bearings of steam-engines, &c.

Z.

ZAFAR. A coil of Spanish rope.

ZAMBO. A term on the Spanish Main for a race produced by the union of
the negro and the Indian; it literally means _bow-legged_.

ZEAL. A quality essentially requisite in forming the character of an
efficient officer, since it comprehends ardour for the service, prompt
obedience to orders, cheerful disposition, and a studious application to
professional science.

ZECCHINO [from _zecca_, a mint]. A gold coin of Italy; average value,
9_s._ 6_d._

ZECHIN. A Turkish coin. (_See_ SEQUIN.)

ZENITH. The pole of the horizon, or that point in the heavens directly
overhead, as nadir is that which is directly under our feet.

ZENITH-DISTANCE. The angular distance of any celestial object from the
zenith at the time of observation. In navigation the meridional
zenith-distance of a heavenly body is much used for finding the
latitude.

ZEPHYR. The west wind, but generally considered to apply to any light
pleasant breeze.

ZERO. The cypher or nought at the beginning of a graduated arc.

ZETETIC. The analytic method of investigating a mathematical problem.

ZIG-ZAG. The winding trench of approach of a besieger, directed by short
turns alternately right and left of the defences of the place, to avoid
being enfiladed b