On 09/20/2013 02:22 PM, Chris Schafer wrote: > Most made in recent time have been optical. Usually a laser against a ball > and the ball just floats on little bits of plastic. If yours is mechanical > it could be quite old. >
Old, but not that old. http://www.google.com/imgres?imgurl=http://www.publicsurplus.com/sms/docviewer/aucdoc/DSC05254.JPG%3Fauc%3D742673%26docid%3D5313331&imgrefurl=http://www.publicsurplus.com/sms/auction/view?auc%3D742673&h=768&w=1024&sz=316&tbnid=UKaJ5sR6mriGgM:&tbnh=91&tbnw=121&zoom=1&usg=__1COLZGHoSY1fPyhTTHtmvRZtCdQ=&docid=U2qu2LXjr9jmiM&sa=X&ei=1ME8UqiPJY3riQL8i4DgCA&ved=0CGAQ9QEwCA&dur=2959 -- Regards, Dick Steffens _______________________________________________ PLUG mailing list [email protected] http://lists.pdxlinux.org/mailman/listinfo/plug
