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Never heard of this before and I see no Youtube videos that show it.
I just completed George Lang's autobiography called "Nobody Knows the Truffles I've Seen." On page 110, he reports that he competed on Arthur Godfrey's "Talent Scouts" show. I quote the book here: "As a parlor trick, I had developed a novel technique of playing two violin bows by using one as a violin and the other as a bow. I became the Paganini of the metier. With the help of a microphone, the sound was quite loud, like a chorus of bees groaning the "Anniversary Waltz" a capella, which was exactly what I was playing."
Has anyone else heard of this or, better yet, can anyone here do this?
Success is the progressive realisation of a worthy ideal. —Earl Nightingale.
Can't say that I have.
I'd offer one bit of advice to anyone who want's to try - make a carbon fiber bow the "violin". It'll stand up to the degree of tension needed a lot better.
I'm a tad skeptical it was a regular bow with regular hair. It'd be mighty hard to get all that hair onto a round stick to play different notes. Playing ONE note, yes. Enough different ones to make a song....? One quarter the usual hair and an octagonal stick, maybe. Don't try anything near the tip, though. Way too much force needed to get a note.
I'm insane enough that I was ready to give it a try, then I remembered finger oils on bow hair. Something to only be done with a bow you don't want to use as a bow until after it's next re-hair. (Or maybe with latex gloves... )
Gadulka (traditional Balkan "fiddle," https://en.wikipedia.org/wiki/Gadulka) and erhu (traditional Chinese "fiddle," https://en.wikipedia.org/wiki/Erhu) are played by touching the strings, not by pressing them against a fingerboard. So--in theory--pressing hairs of the "violin" bow against its stick may not be necessary.