F and G type "Secomak" whistles, developed by Service Electric Co; F whistle was installed in Messageries Maritimes flagship, La Marseillaise, in 1950; smaller type G produced for use on diesel engined warship; principle is based on rotary type of siren, and all working parts are completely enclosed to protect them from moisture; sound rotor or impeller rotates inside stator. (See also Engineering v 175 n 4558 June 5 1953 p 735)
Marine electric for ocean-going ships
Shipbldg Shipg Rec
Shipbuilding and Shipping Record ; 81 , n 23
1953
Aufsatz (Zeitschrift)
Englisch
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