OpenTwo archives, queried live.
Every record below comes from The Met or Smithsonian Open Access and was filtered on that archive’s own rights field before it reached this page. 12 shown for “Johann Nepomuk Maelzel” — 18 records examined, 0 dropped by the rights gate.
Archives queried 2026-08-28 01:02 UTC · fetched live for this request
isPublicDomain field is true for this object.metadata_usage.access reads CC0 — a waiver, not an expired term.Smithsonian Open Access: HTTP 429 from api.si.edu. Results from the remaining archive are shown unchanged — nothing is substituted for a source that did not answer.
Metronome
Johann Nepomuk Maelzel · ca. 1821
Title Page for "Illustrirte Zeitung 1856"
Johann Caspar Nepomuk Scheuren · 1856
Cover design for the "Illustrirte Zeitung"
Johann Caspar Nepomuk Scheuren · 1860
Landscape
Johann Nepomuk Strixner · ca. 1811
Saint Johannes Nepomuk Distributing Alms
Leopold Kupelwieser · 1828
Deutsche Dichtungen mit Randzeichnungen Deutscher Künstler. I. Band (Lider und Bilder, II)
Wilhelm Camphausen · 1843
Illustrated Manuscript Inventory of an Armory for Sale by Lottery
Artist not stated in the record · 16th century
Breastplate
Artist not stated in the record · ca. 1475–85
Mitten Gauntlet for the Left Hand
Artist not stated in the record · ca. 1500
Shield Boss (Umbo)
Artist not stated in the record · 7th century
Shield Boss (Umbo)
Artist not stated in the record · 7th century
Tournament Helm (Kolbenturnierhelm)
Artist not stated in the record · 1510
Where these records came from.
Two archives are wired, and only two. Each one is filtered on its own rights field — never on a title match, and never on the presence of an image file.
- The Met Collection API (Open Access)Rights field:
isPublicDomain. 18 matched · 18 examined · 0 dropped by the rights gate. Kept only where isPublicDomain === true and a file URL was published.12 shown - Smithsonian Open Access API (api.si.edu)Rights field:
content.descriptiveNonRepeating.metadata_usage.access. HTTP 429 from api.si.edu. No records from this archive are shown for this query.Unavailable
These figures describe the pass run at 2026-08-28 01:02 UTC, during this request. A completed pass is kept for 24 hours and replayed for an identical search, which is what keeps repeated queries inside Smithsonian’s 30-requests-per-hour allowance. A pass in which either archive failed to answer is never kept — an outage must not be replayed as though it were a finding about the catalogue.
Wikimedia Commons and the Library of Congress are deliberately not wired. Wikimedia was confirmed, on a live query, to return CC-BY material inside the same result set as genuine public domain works, and filtering it safely has not been designed yet. loc.gov was blocked by bot detection during the source evaluation, so its rights vocabulary has never been observed — and nothing here is built on a field nobody has read.
An image file is a rights claim. It never travels without its field.