_W. B. Rogers on Rotating Rings of Air and Liquids. 247° 
, Of the aar-rings formed by momentary discharges from an aperture. 
4 1. Mode of producing the air-rings.—To render the form and 
internal movements of the escaping air in such cases distinctly 
ers of much smaller size, each 
furnished with a short socket- 
distances on opposite sides of the central hole, two hooks are 
pped in strong water of 
ho 
almost to say that in making the 
_ Tounding eau in little moved as possible, the piebiess “ 
: ms itation near the aperture sufficing to mar the symmetry s 
~ 2. Stages of the ring-formation.—When by a moderately strong 
impulse dhe Tlonaky oF the jar is made to issue in a succession 
