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For questions or comments about the site's content, please email info@ultrasonic-resonators.org. If applicable, please include the relevant web page address (url). All constructive comments are appreciated. (Note — At this time the site can not provide individual assistance with resonator design problems. However, the site will consider such requests when developing future topics or extending current topics.)

If you have information that you would like to contribute, please email info@ultrasonic-resonators.org. The following are specifically needed —

• Information on steels used for resonators, particularly detailed information on heat treatments — temperatures and times for preheat, soaking, quenching, and tempering; the surrounding media (air, inert gas, salts, etc).

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Note: in some cases replies to emails may take up to several weeks.