Explain a Schlieren apparatus

Very Easy to explain - used for many years in aerospace Parts may be harder to get - most likely thru the US Relevant Skills and Experience Have used in the lab for both aerospace (supersonic), structures (perspex models) and plastics melt rheology. What is your actual application - there was no pdf attached to the project Proposed Milestones $5 CAD - First we agree on what you want me to deliver $25 CAD - Once we agree you get your answer/project What is your application or industry?

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i am a mechanical engineer

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Professional aerospace Engineer here Relevant Skills and Experience Experimental aerospace Engineer

A proposal has not yet been provided

. Relevant Skills and Experience . Proposed Milestones $41 CAD - .

I can help you faster and with efficience

Dear Sir, I can help you with this project! Thanks. Relevant Skills and Experience I am a PhD student in Physics, and Professor assistant of Physics at an university.