NASA NTRS · 19930084575
"Schneebeli" and "Birger" silencers
Abstract
The Schneebeli silencer is made entirely of soft sheet steel. It is connected with the engine for receiving the exhaust gases, and consists of two parts: the silencer proper and a conical exit. The Birger silencer, made by the Ad Astra Company in Switzerland, is based on the principle of rapid cooling of the exhaust gases.
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Dollfus, Charles. 1923-06-01. "Schneebeli" and "Birger" silencers. https://ntrs.nasa.gov/citations/19930084575
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