On Fri, 15 Jul 2005 11:51:04 +0100, "Kevin Doyle" wroth:
It's very hard to manufacture a crystal without any overtone modes. A crystal advertised as "overtone" has been cut to emphasize them. It's very likely that a carefully adjusted overtone oscillator will make any crystal into an overtone device.
That connection is both electrical (probably not needed) and mechanical (to take the strain off the fragile leads on the other end).
Jim