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PT Boats of WWII
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PT Boats - General
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[StartQuote] You nailed it Jerry, from Detail Specifications For Building Motor Torpedo Boats, March 1944 ([url]http://archive.hnsa.org/doc/pt/specs/[/url]): [green]1 P. B. for bridge to horn for aft 20 mm. gun cease firing signal, circuit 5U (sec. S71-1).[/green] [green]Circuit 5U-Light projectile machine gun cease firing signal.- This system shall consist of a 24-volt direct current horn similar to Type H5a horn (BuShips Spec. 17S11 (INT)) at the aft 20-mm. gun energized from the bridge. Supply shall be 24-volt direct current. Navigation horn will serve as an audible signal for forward 20-mm. and 50-caliber machine guns. (See sec. S64-1.)[/green] It looks like this Federal Model 35 horn:
Or this Federal Model 42:
[EndQuote]
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