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Daniel
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Vintage Italian sirens

Sat May 25, 2013 6:09 am

Lex orandi, lex credendi, lex vivendi.

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orestis
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Re: Vintage Italian sirens

Sun May 26, 2013 4:46 pm

Excellent finds! The first siren sounds like a vacuum cleaner. Μaybe the motor rotation is reversed or it's just the camera.

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Daniel
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Re: Vintage Italian sirens

Sun May 26, 2013 10:05 pm

On the first video, I can't figure out what the object beside the motor is. A relay? It opens when the tone goes high and closes when it drops. I wonder if this has a two-speed motor like South American sirens, which alternate between two speeds instead of switching on and off like most sirens.
Lex orandi, lex credendi, lex vivendi.

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orestis
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Re: Vintage Italian sirens

Sun May 26, 2013 11:27 pm

Daniel wrote:On the first video, I can't figure out what the object beside the motor is. A relay? It opens when the tone goes high and closes when it drops. I wonder if this has a two-speed motor like South American sirens, which alternate between two speeds instead of switching on and off like most sirens.
It's an electromagnet that moves a vertical? damper. That's why the tone drops. Apparently it doesn't block completely the intake or ports.

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