This image is in the public domain because it is a mere mechanical scan or photocopy of a public domain original, or – from the available evidence – is so similar to such a scan or photocopy that no copyright protection can be expected to arise. The original itself is in the public domain for the following reason:

Public domainPublic domainfalsefalse

This work was never published prior to January 1, 2003, and is currently in the public domain in the United States because it meets one of the following conditions: its author died before 1955; the death date of its author is not known, and it was created before 1905; it is an anonymous work, a pseudonymous work, or a work made for hire, and it was created before 1905. The above provisions are contained in 17 U.S.C. § 303. See also this page for more information.

Category:PD US unpublished#Ladd%20Observatory%20micrometer.tiffCategory:PD-US missing SDC copyright status

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This tag is designed for use where there may be a need to assert that any enhancements (eg brightness, contrast, colour-matching, sharpening) are in themselves insufficiently creative to generate a new copyright. It can be used where it is unknown whether any enhancements have been made, as well as when the enhancements are clear but insufficient. For known raw unenhanced scans you can use an appropriate {{PD-old}} tag instead. For usage, see Commons:When to use the PD-scan tag.

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Note: This tag applies to scans and photocopies only. For photographs of public domain originals taken from afar, {{PD-Art}} may be applicable. See Commons:When to use the PD-Art tag.