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revolving.  Hyatt says they are finally polished there with mixtures containing gasoline.  But the latter leaves greasy film which is detrimental to billiard balls on account of effect of grease.  Says with Bakelite can use alcohol which is much better for that reason.  Showed me two experiments with Bakelite balls, Ivory and his celluloid balls the latter differ from Albany Hyatt ball because they are homogeneous while Albany balls have core of coarse stuff (celluloid waste + filter) and enveloppe of celluloid composition.  By putting balls 
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in hemispherical glass containing mercury with gasoline on top so as to prevent sticking of mercury he "weighs" whether balls truly balance in all directions and the ball has to remain perfectly motionless [[strikethrough]] and not try [[/strikethrough]] in all positions and not try to revolve to seek equilibrium.  This is not the case with Ivory which is always denser in one direction than the other.  His balls and Bakelite balls were perfect in that respect.
Then showed me his apparatus for comparing resiliency and click.  Ivory showed worst, his celluloid balls better but Bakelite and ground bristles showed far superior
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