Watermanship Page: 46
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Figure 27. To use signaling mirror: a. Face point about half-
way between sun and observed object. b. Hold mirror in one hand
about 4 inches from face and sight object to be signaled through
hole or cross in mirror. c. Hold other hand about 12 inches
behind mirror in line with sun and hole through mirror so that
small spot of light appears on hand and is reflected to back face
of mirror (side toward observer). d. Tilt mirror so that spot or
light on mirror disappears through hole, at the same time keeping
observed object sighted through hole. e. When angle between sun
and observed object is small, spot of light will appear on face of
observer thus allowing both hands to tilt mirror.
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United States. War Department. Watermanship, book, April 25, 1944; Washington D.C.. (digital.library.unt.edu/ark:/67531/metadc96650/m1/52/: accessed May 21, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.