Watermanship Page: 45
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a triangle and weighted, or a similar device will serve
as a sea anchor if it provides drag.
ai. Storm oil. A container holding 1 gallon of vege-
table or mineral oil. It is fitted with two valves, one at
each end, which should be opened slightly to allow a
slow seepage of oil. The oil tends to reduce the forming
of waves by wind and breaking of seas. Lashing rings
are provided on the container to secure it inside the
canvas tip of the sea anchor.
ai. Signal flag. A yellow or bright orange bunting, 4
feet 6 inches by 8 feet, with ties for attaching to a staff
for signaling rescue parties. To signal airplanes two
men hold ends of flag and tilt it from side to side.
ak. Signaling mirrors. (1) Two polished metal mir-
rors with about 20 square inches of reflecting surface on
each side and a sighting hole in center. They are coated
with grease and wrapped in a container marked "signal-
ing mirrors." In clear weather flashes may be seen up
to 10 miles. Any reflecting surface such as a flattened
tin can or wet blade of an oar, may be used.
(2) To use signaling mirror (fig. 27)
(a) Face a point about half-way between sun and
(b) Hold mirror in one hand about 4 inches from the
face, and through hole or cross in mirror, sight object
to be signaled.
(c) Hold the other hand about 12 inches behind mir-
ror in line with sun and with the hole through the mir-
ror, so a small spot of light appears on the hand. The
spot of light on the hand is reflected on the side of the
mirror facing the user.
(d) Now tilt mirror so the spot of light on it dis-
appears through the hole in it, keeping the observed
object sighted through the hole. In this position sun-
light will be reflected to the observed object.
(e) Practice flashing from bow to stern to acquire
efficiency in its use.
NOTE. When angle between sun and observed object is small,
the spot of light will appear on the face of.4the observer, thus
allowing both hands to be used in tilting mirror.
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United States. War Department. Watermanship, book, April 25, 1944; Washington, D.C.. (digital.library.unt.edu/ark:/67531/metadc96650/m1/51/: accessed October 20, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.