The string of the humming-top moves the pump handle, and that spins.
Why do we see the figures painted upon the humming-top, before it spins, but not while it is spinning?
They looked like the dark band on the humming-top when you spin it.
A humming-top on the subject would have been precisely as instructive and convincing.
More like the sounds of a humming-top, remarks a phlegmatic German traveller.
