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 Shipbldg and Shipg Rec v 81 n 23 June 4 1953 p 732)
Marine electric for ocean-going ships
Engineering
Engineering ; 175 , n 4558
1953
Article (Journal)
English
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Marine electric for ocean-going ships
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