• The Plumb-McEwan experiment: This is a laboratory counterpart of the QBO (the quasibiennial oscillation of the east-west winds in the equatorial lower stratosphere). • The flow in a stratified, non-rotating annulus is driven away from solid rotation (anti-friction again) by nothing but the imposition of fluctuations at an upper or lower boundary. These are organized by the gravity-wave propagation mechanism: Experiment easier with the apparatus upside down: I This is the Kyoto University version of the Plumb-McEwan experiment: www.gfd-dennou.org/library/gfd_exp/ or websearch QBO “Tech Tips”