The Traction of Glass Polishing

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The art of polishing glass is largely a matter of maintaining and controlling "contact." "Contact" is a word often heard in glass-shops, especially those working optical glass, but is difficult to define. "The contact" is the interface of the polisher and work and is also a measure of the intimacy of the fit between the two. We may have "good contact," "poor contact," "contact strong on the edge," etc.

F. W. Preston