I would encourage you examine the Schwenningen church records (perhaps after perusing the IGI at www.familysearch.org) and see if you can find your Jaeckles in Schwenningen. The only information I have is on the URL I posted earlier.

You can find it again here:

http://freepages.genealogy.rootsweb.com/~jillaine/jauch/

Good luck!

-- Jillaine Smith
Washington DC