Talk:Timeline of International Kilogram Prototypes

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Article overview and purpose

This list article documents the history, custody, and calibration records of the International Prototype of the Kilogram (IPK) and its official/national copies. Its scope includes:

Provenance and allocation of each prototype
Measurement data from official verification campaigns, with emphasis on the 1889 certification, second verification (c. 1953), and third verification (1988–1992)
Notable events affecting mass stability, such as cleaning, recalibration, or transfer between custodians

The aim is to maintain a continuity‑safe, citation‑rich record that is both technically rigorous and accessible to non‑specialist readers. All data are referenced to published, reliable sources (e.g., BIPM publications, *Metrologia*, national metrology institute reports) with page‑level citations where possible. Editorial decisions about formatting, table structure, and note style are made for long‑term clarity, stability, and compatibility with Wikipedia’s sourcing and style guidelines.

The initially published version of this list incorporated only the information and sourcing from the main International Prototype of the Kilogram article. It will be expanded to cover additional detail from other sources beyond the scope of the original page.Dhaluza (talk) 20:55, 14 August 2025 (UTC)[reply]

AI‑assisted drafting note

Portions of the article’s content — specifically the table formatting, data organization, and some note text — were drafted with assistance from Microsoft Copilot. All values and statements have been checked against the cited reliable sources by a human editor prior to inclusion, in accordance with Wikipedia’s verifiability, neutrality, and copyright policies. This notice is provided for transparency.Dhaluza (talk) 20:55, 14 August 2025 (UTC)[reply]

Did you know nomination

The following is an archived discussion of the DYK nomination of the article below. Please do not modify this page. Subsequent comments should be made on the appropriate discussion page (such as this nomination's talk page, the article's talk page or Wikipedia talk:Did you know), unless there is consensus to re-open the discussion at this page. You can locate your hook here.No further edits should be made to this page.

The result was: rejected, closed by Narutolovehinata5 talk 23:47, 19 September 2025 (UTC)[reply]

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Comment or view
Article history

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International Prototype Kilogram #20

... that platinum‑alloy cylinders (pictured) underpinned global trust in scientific discovery, industrial manufacturing, and international trade for over a century?

Source: "World Metrology Day - 20 May 2025". [1] International Bureau of Weights and Measures and International Organization of Legal Metrology. "…the signing of the Metre Convention in Paris, in 1875 … provides the basis for a worldwide coherent measurement system that underpins scientific discovery and innovation, industrial manufacturing and international trade…"
Source: "Anniversary – Metre Convention". [2] Anniversary - Metre Convention - BIPM. International Bureau of Weights and Measures. Retrieved 20 August 2025. Measurements underpin every aspect of modern life—from ensuring fair trade and advancing technology to addressing critical global challenges like healthcare and food safety. The Metre Convention established the foundation for reliable, consistent and traceable measurement standards, which are essential for fostering trust and cooperation in a globalized world."

ALT1: ... that for more than a century, platinum‑alloy cylinders (pictured) underpinned global trust in scientific discovery, industrial manufacturing, and international trade?
Reviewed:
Comment: Expanded from International Prototype of the Kilogram#Copies of the IPK

Moved to mainspace by Dhaluza (talk). Number of QPQs required: 0. Nominator has fewer than 5 past nominations.

Dhaluza (talk) 23:01, 20 August 2025 (UTC).[reply]

Comment: Not a review but, I bolded the article you are nominating and italized the pictured. Please do this next time when you are nominating. Thanks.

Starting review ...

Hook fact verifies against source and article.
Overall, sourcing looks excellent and properly cited.
No obvious copyvio problems from Earwig
The image is not a great photo. There's tons of photos of IPKs, I'm sure a better example could be found. I recommend not using this image.
The nomination eligibility is based on WP:5X of text originally in another article. Unfortunately, most of the added material is in a large table and WP:DYKPROSE says prose size ... should exclude ... tables. Much as I would love to see this topic on the main page, unless I'm misunderstanding the requirement, this is a problem which will need a substantial rewrite to resolve. RoySmith (talk) 14:10, 12 September 2025 (UTC)[reply]

@Dhaluza: hasn't edited in nearly a month, and given that this doesn't seem to be anywhere near a 5x expansion I'm marking this for closure.--Laun chba ller 16:11, 19 September 2025 (UTC)[reply]