Both the autochrome photograph of the Humphrey children and the diascope mirror viewing device are well preserved and still viewable in 2015 .
The diascope mirror viewing device closes into itself in a leather - bound case similar in size and appearance to a book .
Both the autochrome photograph of the Humphrey children and the diascope mirror viewing device , which closes into itself in a leather - bound case similar in size and appearance to a book , are well preserved and still viewable in 2015 .