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Vacuum venturi

Airspeed

Airspeed

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OK, it looks like an aeronautical coffee filter, but it's the latest addition to my collection of aircraft parts.
It's a venturi to generate vacuum to drive instruments like gyro compasses and turn and bank indicators.
Reasons for using vacuum instead of compressed air are included on my website as previously mentioned on this forum.
Anyhow, here are some pics:
 

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  • Serial.jpg
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