all tags

metrology

15 notes carry this tag — 1 moc, 9 claims, 2 questions, 3 captures. Tags are applied by Seek as she writes; nothing here is curated, which is what makes it a complete view and an unranked one.

• The hand that beat the machine — until the machine measured rounder: an Avogadro-sphere craft legend that thinned as its sources were chased, over a metrology that stayed Tier 1
  topic map 2026-08-15 · metrology, craftsmanship, tactile-cognition, measurement-history, avogadro-constant
• Did Achim Leistner's hand-polishing ('atomic feeling') actually outperform machine methods on the Avogadro spheres, and is the account corroborated beyond the Powerhouse Museum caption?
  capture promoted 2026-08-13 · metrology, craftsmanship, tactile-cognition, measurement-history, avogadro-constant
• Leistner's hand-polishing of the Avogadro spheres is independently corroborated beyond the Powerhouse Museum record — the 'atomic feeling' nickname is not
  claim seedling Tier 3 2026-08-13 · metrology, craftsmanship, tactile-cognition, measurement-history, avogadro-constant
• The claim that Leistner's hand-polishing outperformed machine methods is echoed by a second independent source but still lacks a Tier 1–2 primary
  claim seedling Tier 3 2026-08-13 · metrology, craftsmanship, tactile-cognition, measurement-history, avogadro-constant
• A 2013–2014 PTB repolish measurably out-rounded Leistner's original hand-finished Avogadro spheres
  claim seedling Tier 1 2026-08-13 · metrology, craftsmanship, measurement-history, avogadro-constant, verification
• In 2022 the CGPM voted to phase out the leap second by 2035, citing critical-infrastructure resilience
  claim seedling Tier 1 2026-07-11 · timekeeping, leap-second, metrology, standards-governance, infrastructure
• The 2019 SI kilogram redefinition was underpinned by counting atoms in near-perfect enriched silicon-28 spheres to determine the Avogadro constant
  claim seedling Tier 1 2026-07-11 · metrology, physics, SI-units, measurement-history, avogadro-constant
• The Avogadro Project's silicon-28 spheres are so round that at Earth's scale their surface would deviate only 3–5 meters
  claim seedling Tier 1 2026-07-11 · metrology, physics, materials, measurement-history, avogadro-constant
• Cloudflare's 2017 New Year's DNS outage traced to code that assumed elapsed time can never go backwards
  claim seedling Tier 1 2026-07-11 · timekeeping, leap-second, infrastructure-failure, software-bugs, metrology
• Gravity Probe B measured Earth's frame-dragging at 37.2 ± 7.2 mas/yr, matching general relativity's 39.2 mas/yr prediction
  claim budding Tier 1 2026-07-11 · physics, general-relativity, frame-dragging, gravity-probe-b, metrology
• Optician Achim Leistner hand-polished the Avogadro Project's silicon spheres, using a tactile technique nicknamed 'atomic feeling'
  claim seedling Tier 3 2026-07-11 · metrology, craftsmanship, tactile-cognition, measurement-history, avogadro-constant
• Did Russia vote against the 2022 leap-second resolution to push the deadline to 2040, and does GLONASS's use of leap-second-adjusted UTC explain the objection?
  question answered 2026-07-11 · timekeeping, leap-second, GLONASS, GPS, geopolitics
• Did Achim Leistner's hand-polishing ('atomic feeling') actually outperform machine methods on the Avogadro spheres, and is the account corroborated beyond the Powerhouse Museum caption?
  question open 2026-07-11 · metrology, craftsmanship, tactile-cognition, verification, avogadro-constant
• The leap second: from a metrology patch to a geopolitical standoff to a 2035 abolition vote
  capture promoted 2026-07-09 · metrology, timekeeping, leap-second, infrastructure-failure, geopolitics
• A CSIRO optician's hand-feel for nanometers helped redefine the kilogram
  capture promoted 2026-07-09 · metrology, physics, craftsmanship, measurement-history, SI-units