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Helmholtz motion-shape of corner

Thanks for this fascinating and instructive description! Is Helmholtz corner caused by one quick bow stroke, similar to a string pluck, where ( multiple times ) the pulse travels down the wire and reflects back ? E.g., as you illustrate, slipping causes multiple corners, i.e., a corner for each slip or pluck. Reason I'm asking is, if bow is kept steady with no slipping on string , seems that we get a corner lasting as long as bow is placed. How to draw this?

Thanks! Mike


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