
We all know that it's impossible to tell if your bow is going straight without a mirror or something, since the angle of vision messes up your perception. And you can only do so much practicing in front of a mirror staring off to the side. Well, Virginia showed me that the bow slides perpendicular to the strings if it isn't moving straight, and you can tell which way it's off by the direction in which it slides.
Try it! If you're pulling the bow too close to your body on the down stroke (the more common error among beginners, I think), then the bow slides toward the scroll on the down stroke and toward the bridge on the up stroke. If you're pushing the bow too much away from your body on the down stroke (which is my problem...I overcompensate for the tendency described above), then the bow slides toward the bridge on the down stroke and toward the scroll on the up stroke. So you can tell which way you need to correct by watching which way the bow slides.
This is the kind of stuff my previous teachers never showed me. So many errors are possible on the violin, to be sure, but nothing that isn't correctable if you know what to look for. There's reason for optimism. :)
I try to do it without looking in a mirror. I agree that you can compare to the other strings. You can also try to see if the bow is glued to the exact same contact point all the time.
I also have a headache today, from being cross-eyed for so long. From such a close perspective, it's difficult to tell what the heck is going on. I sympathize with my students.
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