"take a one-inch-wide ribbon, for instance. with each turn of the spool, the ribbon must move...

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Page 1: "Take a one-inch-wide ribbon, for instance. With each turn of the spool, the ribbon must move one inch across the spool surface. But what happens if the ribbon varies in
Page 2: "Take a one-inch-wide ribbon, for instance. With each turn of the spool, the ribbon must move one inch across the spool surface. But what happens if the ribbon varies in
Page 3: "Take a one-inch-wide ribbon, for instance. With each turn of the spool, the ribbon must move one inch across the spool surface. But what happens if the ribbon varies in