https://omeka.uvu.edu/files/original/bd7f3423a5d85c21ac3b6efac8b1bb10.JPG 9e792c72c644431b38704d8babf1f2b0 Dublin Core The Dublin Core metadata element set is common to all Omeka records, including items, files, and collections. For more information see, http://dublincore.org/documents/dces/. Title A name given to the resource Door alarm [tilt ball-switch security alert device] Source A related resource from which the described resource is derived Donna Crouch Collection Date A point or period of time associated with an event in the lifecycle of the resource circa 1965 References A related resource that is referenced, cited, or otherwise pointed to by the described resource. <a href="https://en.wikipedia.org/wiki/Security_alarm" title="Wikipedia: Security Alarm">Wikipedia: Security Alarm</a><a href="https://www.instructables.com/id/Build-your-own-tilt-switch/" title="Instructables: Tilt Switch"><br />Instructables: Tilt Switch</a>