W. B. Rogers on Rotating Rings of Air and Liquids. 249° 
ect form and rapid rotation, 
the air of the reservoir should 
° 
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2 
ov 
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Caine a 
When the ring carries a train it is to discern that the 
cloudy spiral is continuous with this attendant mass, and really 
issues from it near the inner circumference of the ring. Ina yet 
‘earlier stage of the action we are able to mark the beginning of 
~ this two-fold spiral by observing how each volute as it draws its 
