TECHNICAL TERMS. [AIT. N° IN. 
4'72 
sea-stream, when it is exposed on one side to the ocean, 
and affords shelter from the sea or waves, to vessels 
within it. 
Tongue .—A point or shelf of ice projecting nearly horizon¬ 
tally from the part of a mass that is under-water. 
Tongues are firmly attached to the pieces of ice from 
which they project, and arc sometimes so deep under¬ 
water, that ships are either grounded upon them, or sail 
over them. 
Trend, or Trending .—The direction of a line of coast, or 
of ice as regards the points of the compass, or the true 
meridian. Thus, ice or land is said to trend to the south¬ 
ward, when its direction in the part referred to lies near¬ 
ly north and south. Trending differs from bearing, in¬ 
asmuch as it is generally used to describe the direction of a 
coast or line of ice in regard to itself; whereas the bearing 
usually refers to the direction of an object, in regard to 
the place of the observer. Thus the trending of a coast 
betwixt two points of land, A and B may be north and 
south, or south from A to 13, whilst the bearing of A 
from the observer, is perhaps west, and of 13 perhaps 
south-'west. The bearing of land is variable, depending 
on the situation of the observer: the trending fixed, de¬ 
pending on the situation of the land. 
Water-sky .—A dark appearance of the atmosphere, near 
the horizon, indicating clear water below it. 
