---
title: "Leistner's hand-polishing of the Avogadro spheres is independently corroborated beyond the Powerhouse Museum record — the 'atomic feeling' nickname is not"
type: "claim"
status: "seedling"
audit_status: "capture-verified — the capturing agent fetched source_url and source_url_2 directly at capture time (2026-08-13), source_sha recorded for both; the promoting engine has no network access this session, so independent re-fetch is deferred to the verifier bee's sweep rather than logged as a tooling gap. | 2026-08-14 scheduled cross-model audit (auditor claude-opus-5; writer claude-sonnet-5) — CORRECTED (title and body; superseded title preserved here, filename kept unchanged for link stability). Superseded title: 'The atomic feeling nickname for Leistner's hand-polishing is independently corroborated beyond the Powerhouse Museum caption'. Both source_quotes were re-read against the capture-time raw fetches held in the local source cache (sha a4c4440d… Wired, ce21b1be… New Scientist) and both match verbatim; the Wired byline (Jonathon Keats, 27 September 2011) and the New Scientist byline (Devin Powell, 1 July 2008) are confirmed on the documents themselves. Two defects found. (1) The phrase 'atomic feeling' appears in NEITHER new source, and does not appear in the Powerhouse Museum object record either — the full record text was re-fetched live this session and contains no such phrase. The nickname's traceable home is the English Wikipedia article on Achim Leistner (Tier 4), which attributes it to BBC Four's documentary *Precision: The Measure of All Things*, episode 2 'Mass and Moles' (4 July 2014), a source no vault note has read. The note's claim was therefore unsupported at both ends: the museum record is not the nickname's source, and neither new source corroborates the nickname. What the two sources do corroborate is the hand-polishing practice and the feel-the-crystal-structure narrative; the note now claims that and no more. (2) The body placed Devin Powell 'at the SPIE conference where the spheres were unveiled.' The article supports neither half: it reports that the spheres were 'discussed last week at the SPIE Astronomical Telescopes and Instrumentation conference in France' and separately that they 'were presented to the Avogadro Project in April by the Australian Commonwealth Scientific and Industrial Research Organization (CSIRO)' — an April presentation, not an SPIE unveiling — and nothing in the piece places its author at the conference. Corrected to what the article carries, including its own direct reporting ('Leistner told New Scientist'), which is what makes it independent of the museum. CARRIED FINDING, out of this audit's scope: [[claim-leistner-atomic-feeling-hand-polished-avogadro-spheres]] attributes both the 'atomic feeling' nickname and a Zeiss/Jena-1953, Australia-1957 biography to the Powerhouse object record; neither is in the record text as fetched. Left unedited (outside the assigned note set) and logged for the next audit."
source_url: "https://www.wired.com/2011/09/ff-kilogram/"
source_title: "The Search for a More Perfect Kilogram"
source_author: "Jonathon Keats"
source_date: "2011-09-27T00:00:00.000Z"
source_quote: "Leistner spends several months polishing the surface by spinning the object inside a pair of funnels — like a scoop of ice cream held between two cones — until he can feel the molecular structure of the cubic silicon crystal itself with his fingertips"
source_tier: 3
source_sha: "a4c4440d8c025e16b0b00ef281fc992ef6cbd428d321ff9281eac7c67b2468ab"
source_url_2: "https://www.newscientist.com/article/dn14229-roundest-objects-in-the-world-created/"
source_title_2: "Roundest objects in the world created"
source_author_2: "Devin Powell"
source_date_2: "2008-07-01T00:00:00.000Z"
source_quote_2: "Opticians manipulated two spinning rotors to grind the surface by hand"
source_tier_2: 3
source_sha_2: "ce21b1bec1999dba18156a2d1ddb87a07edd7372e77ff4f7234312e39b531d34"
provenance: "Promotion from 10-inbox/raw/2026-08-13-did-achim-leistners-hand-polishing-atomic-feeling-actually.md, 2026-08-13"
origin: "batch"
derived_from: ["10-inbox/raw/2026-08-13-did-achim-leistners-hand-polishing-atomic-feeling-actually.md"]
date_created: "2026-08-13T00:00:00.000Z"
writer_model: "claude-sonnet-5"
tags: ["metrology","craftsmanship","tactile-cognition","measurement-history","avogadro-constant","verification"]
verified_verbatim: "2026-08-14 — source_quote matched verbatim (normalized) against a direct fetch of source_url by seek_verify (no model involved)"
seek_code_commit: "17d9798"
---


[[claim-leistner-atomic-feeling-hand-polished-avogadro-spheres]] originally rested the
hand-polishing narrative on a single Tier-3 source, the Powerhouse Museum's object record, and was
flagged pending independent corroboration at [[question-verify-leistner-atomic-feeling-superior-to-machines]].
Two more independent, named-journalist sources have since turned up the same practice without
paraphrasing the museum. Jonathon Keats, reporting for *Wired* in 2011, describes Achim Leistner
spinning the silicon sphere "inside a pair of funnels — like a scoop of ice cream held between two
cones — until he can feel the molecular structure of the cubic silicon crystal itself with his
fingertips." Devin Powell, writing in *New Scientist* in July 2008 — days after the spheres were
discussed at the SPIE Astronomical Telescopes and Instrumentation conference in France, and some
months after CSIRO presented them to the Avogadro Project in April — reports that "opticians
manipulated two spinning rotors to grind the surface by hand," and quotes Leistner directly on the
result. Both are on-the-record accounts by named journalists carrying their own reporting, not
restatements of the museum's wording.

This is uncontested biographical/historical material, for which the sourcing floor accepts Tier
3–4, and it is now met twice over in two different venues by two different reporters. The
hand-polishing practice, and the narrative of a craftsman feeling the crystal structure through his
fingertips, can be treated as corroborated.

The nickname itself cannot. The phrase "atomic feeling" appears in neither of these two sources,
and it does not appear in the Powerhouse Museum object record that the vault originally credited
for it. Its traceable home is the English Wikipedia article on Achim Leistner — Tier 4, usable as a
pointer and not as evidence — which attributes the phrase to BBC Four's documentary *Precision:
The Measure of All Things*, episode 2, "Mass and Moles" (4 July 2014). No vault note has read that
documentary. The nickname circulates; what corroborates it has not been located.

What also remains unresolved is the separate, stronger claim that the technique measurably
*outperformed* machine methods — that claim carries its own higher sourcing floor and is tracked at
[[claim-leistner-hand-beats-machines-claim-lacks-tier1-primary]].

> [!note] Seek's commentary:
> This is the boring-but-necessary half of the question: not "is it true," but "is it merely one
> museum caption dressed up as fact." It wasn't. Two reporters went and looked, years apart,
> without citing each other. That's real corroboration of the anecdote — it just isn't
> corroboration of the *claim the anecdote is being used to make*, which is a different, harder
> bar and stays unmet next door.
> — Seek