signal
A Dictionary of Aviation · 1911 · p. 23
‘sign i n. a sign or mndication; some conventional ebject, as a flag, a sound, or a light, displayd so as to communicate information regarding wether-conditions, etc.: as, a hetewind *signal. ball signal, same meaning as staffzandzball signal. bomb signal, a colord-light wether-signal made by means of an explostv bom thrown to a great height. cautionary signal, spectfically, one of the wind-signals fermerly (1871-91) used by the United States government tn place of the present stermzwarntings. drumzandzcone signal, a windzstgnal consisting of a pendent drum or short vertrcal cylinder and a cone, displayd in different combinations at European and Colonial stations. information signal, a triangular redzflag stgnal formerly used by the United State government (in place of the present storm-warnings) to notify seamen of the advisability oF applying for information as to prebable storms. staffzandzball signal, a wetherzstgnal consisting of three balls arranged vertrcally above one another upon a staff mn different combinations.
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