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. 13 shown for “Howard and Bousfield Boiler, Patent Model” — 41 records examined, 22 dropped by the rights gate.
Archives queried 2026-09-05 20:41 UTC · fetched live for this request
isPublicDomain field is true for this object.metadata_usage.access reads CC0 — a waiver, not an expired term.
The Jabach Family
Charles Le Brun · ca. 1660
Howard and Bousfield Boiler, Patent Model
Artist not stated in the record · 1871
Fowler’s Patent Model of a Furnace Steam Boiler - ca 1856
Artist not stated in the record · ca 1856
Ritty Steam Boiler, Patent Model
Artist not stated in the record · 1873
Wiegand Steam Boiler, Patent Model
Artist not stated in the record · 1867
Holley’s Patent Model of a Steam-Boiler Furnace – 1880
Artist not stated in the record · ca 1880
Corliss Marine-Boiler Improvements, Patent Model
Artist not stated in the record · 1862
Corliss Water-Tube Boiler, Patent Model
Artist not stated in the record · 1879
Luders Steam Boiler, Patent Model
Artist not stated in the record · 1869
Trowbridge Steam Generator, Patent Model
Artist not stated in the record · 1876
Hiram Maxim Pumping Engine, Patent Model
Artist not stated in the record · 1874
Lawler's Patent Model of a Hot Water Heater - 1877
Artist not stated in the record · 1877-04-10
Babcock and Wilcox Steam Generator, Patent Model
Artist not stated in the record · 1876
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. 1 matched · 1 examined · 0 dropped by the rights gate. Kept only where isPublicDomain === true and a file URL was published.1 shown - Smithsonian Open Access API (api.si.edu)Rights field:
content.descriptiveNonRepeating.metadata_usage.access. 1503516 matched · 40 examined · 22 dropped by the rights gate. Kept only where metadata_usage.access === "CC0" and an image resource was published.12 shown
These figures describe the pass run at 2026-09-05 20:41 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.