{"query": "One half-life of a radioactive clock", "count": 20, "results": [{"id": "card_works_radiometric", "title": "One half-life of a radioactive clock", "shelf": "the-works", "surface": "secular", "snippet": "After one half-life — 5,730 years for carbon-14 — exactly half the original atoms remain. This is how charcoal, bone and shell are dated.  Worked & sealed by the engine — N = 100·½¹ = 50 after one hal", "authority_tier": "verified", "source": "The Works — worked & sealed", "generated": false}, {"id": "card_theory_general_relativity", "title": "General relativity", "shelf": "theories", "surface": "secular", "snippet": "General relativity — an engine domain that can touch it: physics. Calibration: partial — specific relations verify; the field equations as a whole are map-only. Gravity is not a force but the CURVATUR", "authority_tier": "reference", "source": "The Theory Assay — calibrated, not judged (docs/THEORY_CATALOG.md)", "generated": false}, {"id": "card_n_cfb57dd6b005", "title": "Radioactive decay — the exponential clock of matter", "shelf": "science", "surface": "secular", "snippet": "Sealed in-domain: after one half-life exactly half remains; after two, exactly one\nquarter (2^(−2) = 1/4, exact); carbon-14's decay constant is ln2/5730 years = 3.833×10⁻¹²\nper second: https://narrowh", "authority_tier": "engine_derived", "source": "Concordance assay — 2026-07-09", "generated": false}, {"id": "card_src_book_61494", "title": "The Modern Clock A Study of Time Keeping Mechanism; Its Construction, Regulation and Repair — Ward L. Goodrich", "shelf": "gutenberg", "surface": "secular", "snippet": "The Modern Clock A Study of Time Keeping Mechanism; Its Construction, Regulation and Repair, by Ward L. Goodrich. Subjects: Clocks and watches; Clocks and watches -- Repairing. Read the full text (pub", "authority_tier": "reference", "source": "Project Gutenberg (public domain)", "generated": false}, {"id": "card_src_book_12694", "title": "History of the American Clock Business for the Past Sixty Years, and Life of Chauncey Jerome Barnum's Connection with the Yankee Clock Business — Chauncey Jerome", "shelf": "gutenberg", "surface": "secular", "snippet": "History of the American Clock Business for the Past Sixty Years, and Life of Chauncey Jerome Barnum's Connection with the Yankee Clock Business, by Chauncey Jerome. Subjects: Clock and watch making --", "authority_tier": "reference", "source": "Project Gutenberg (public domain)", "generated": false}, {"id": "card_src_book_855", "title": "Clocks — Jerome K. (Jerome Klapka) Jerome", "shelf": "gutenberg", "surface": "secular", "snippet": "Clocks, by Jerome K. (Jerome Klapka) Jerome. Subjects: Essays; Clocks and watches. Read the full text (public domain): https://www.gutenberg.org/ebooks/855", "authority_tier": "reference", "source": "Project Gutenberg (public domain)", "generated": false}, {"id": "card_src_book_45772", "title": "Chats on Old Clocks — Arthur Hayden", "shelf": "gutenberg", "surface": "secular", "snippet": "Chats on Old Clocks, by Arthur Hayden. Subjects: Clocks and watches. Read the full text (public domain): https://www.gutenberg.org/ebooks/45772", "authority_tier": "reference", "source": "Project Gutenberg (public domain)", "generated": false}, {"id": "card_n_bbecbbc24fb6", "title": "The nucleus — the strongest glue and the slowest clocks", "shelf": "science", "surface": "secular", "snippet": "Past gamma rays the spectrum ends and the nucleus itself begins. One chain,\neight steps, sealed — four of them IN-DOMAIN by the nuclear fleet: https://narrowhighway.com/s/8a5e89ab13bc499f39240c64360d9", "authority_tier": "engine_derived", "source": "Concordance assay — 2026-07-09", "generated": false}, {"id": "card_src_book_49070", "title": "Nuclear Clocks Revised — Henry Faul", "shelf": "gutenberg", "surface": "secular", "snippet": "Nuclear Clocks Revised, by Henry Faul. Subjects: Radioactive dating. Read the full text (public domain): https://www.gutenberg.org/ebooks/49070", "authority_tier": "reference", "source": "Project Gutenberg (public domain)", "generated": false}, {"id": "card_src_book_17576", "title": "A Rudimentary Treatise on Clocks, Watches and Bells — Edmund Beckett, Baron Grimthorpe", "shelf": "gutenberg", "surface": "secular", "snippet": "A Rudimentary Treatise on Clocks, Watches and Bells, by Edmund Beckett, Baron Grimthorpe. Subjects: Clocks and watches; Bells. Read the full text (public domain): https://www.gutenberg.org/ebooks/1757", "authority_tier": "reference", "source": "Project Gutenberg (public domain)", "generated": false}, {"id": "card_n_770170ab1111", "title": "The linguistic clock — the comparative method dates the dispersal", "shelf": "science", "surface": "secular", "snippet": "The same history is written in the words. The comparative method reconstructs ancestral\ntongues from their daughters (sealed in the language-evolution wing), and glottochronology's\nexponential vocabul", "authority_tier": "engine_derived", "source": "Concordance assay — 2026-07-09", "generated": false}, {"id": "card_src_book_73581", "title": "The blackboard clock — Eva Aldrich", "shelf": "gutenberg", "surface": "secular", "snippet": "The blackboard clock, by Eva Aldrich. Subjects: Clocks and watches; Time. Read the full text (public domain): https://www.gutenberg.org/ebooks/73581", "authority_tier": "reference", "source": "Project Gutenberg (public domain)", "generated": false}, {"id": "card_c_01a2b706782a", "title": "Radioactive decay — the exponential clock of ↔ Capacitor — the exponential clock (RC time c", "shelf": "connections", "surface": null, "snippet": "The same exponential that discharges a capacitor empties a nucleus's odds — the bench's RC clock and the carbon clock are one curve wearing different constants.  — a concord the card itself states; mi", "authority_tier": "engine_derived", "source": "Concordance miner — 2026-07-11", "generated": false}, {"id": "card_src_book_54546", "title": "Time and Clocks: A Description of Ancient and Modern Methods of Measuring Time — Henry H. (Henry Hardinge), Sir Cunynghame", "shelf": "gutenberg", "surface": "secular", "snippet": "Time and Clocks: A Description of Ancient and Modern Methods of Measuring Time, by Henry H. (Henry Hardinge), Sir Cunynghame. Subjects: Clocks and watches; Time. Read the full text (public domain): ht", "authority_tier": "reference", "source": "Project Gutenberg (public domain)", "generated": false}, {"id": "card_src_book_15569", "title": "The Cuckoo Clock — Mrs. Molesworth", "shelf": "gutenberg", "surface": "secular", "snippet": "The Cuckoo Clock, by Mrs. Molesworth. Subjects: Fantasy literature; Clocks and watches -- Juvenile fiction. Read the full text (public domain): https://www.gutenberg.org/ebooks/15569", "authority_tier": "reference", "source": "Project Gutenberg (public domain)", "generated": false}, {"id": "card_n_b10117556d41", "title": "The two clocks — quartz, cesium, and the second", "shelf": "science", "surface": "secular", "snippet": "The wrist clock and the world clock. Quartz beats 32,768 times a second; the SI second is\nDEFINED as 9,192,631,770 oscillations of cesium-133's hyperfine transition (since 1967) —\nsealed: the cesium c", "authority_tier": "engine_derived", "source": "Concordance assay — 2026-07-09", "generated": false}, {"id": "card_src_book_52161", "title": "Bangerter's Inventions; His Marvelous Time Clock — Everett Lincoln, 1863- [Editor] King", "shelf": "gutenberg", "surface": "secular", "snippet": "Bangerter's Inventions; His Marvelous Time Clock, by Everett Lincoln, 1863- [Editor] King. Subjects: Clocks and watches; Perpetual motion; Bangerter, Friedrich, 1868-. Read the full text (public domai", "authority_tier": "reference", "source": "Project Gutenberg (public domain)", "generated": false}, {"id": "card_src_book_33198", "title": "The Borghesi Astronomical Clock in the Museum of History and Technology Contributions from the Museum of History and Technology, Paper 35 — Silvio A. Bedini", "shelf": "gutenberg", "surface": "secular", "snippet": "The Borghesi Astronomical Clock in the Museum of History and Technology Contributions from the Museum of History and Technology, Paper 35, by Silvio A. Bedini. Subjects: Astronomical clocks. Read the ", "authority_tier": "reference", "source": "Project Gutenberg (public domain)", "generated": false}, {"id": "card_n_d8471389950e", "title": "Tracing the peoples — genes and words, two clocks reading one history", "shelf": "science", "surface": "secular", "snippet": "A people can be traced across DISTANCE and TIME by two records that survive in the body and\nin the mouth: the genome and the language. They are the same method — a molecular clock ticking,\na tree bran", "authority_tier": "engine_derived", "source": "Concordance assay — 2026-07-09", "generated": false}, {"id": "card_src_book_17021", "title": "Watch and Clock Escapements A Complete Study in Theory and Practice of the Lever, Cylinder and Chronometer Escapements, Together with a Brief Account of the Origin and Evolution of", "shelf": "gutenberg", "surface": "secular", "snippet": "Watch and Clock Escapements A Complete Study in Theory and Practice of the Lever, Cylinder and Chronometer Escapements, Together with a Brief Account of the Origin and Evolution of the Escapement in H", "authority_tier": "reference", "source": "Project Gutenberg (public domain)", "generated": false}]}