{"query": "Build a Crystal Radio", "count": 20, "results": [{"id": "card_n_072d00893a26", "title": "Build a Crystal Radio", "shelf": "maker", "surface": "secular", "snippet": "A working radio with no batteries — runs on the energy of the radio waves themselves. The first DIY electronics project a generation of American kids built.", "authority_tier": "external_aligned", "source": "Popular Science, March 1922 (and many others)", "readable": false, "generated": false}, {"id": "card_theory_third_law_of_thermodynamics", "title": "Third law of thermodynamics", "shelf": "theories", "surface": "secular", "snippet": "Third law of thermodynamics — an engine domain that can touch it: thermodynamics. Calibration: map-only — a limiting statement, not a computation. As temperature approaches absolute zero, the entropy ", "authority_tier": "reference", "source": "The Theory Assay — calibrated, not judged (docs/THEORY_CATALOG.md)", "readable": false, "generated": false}, {"id": "card_theory_electromagnetic_spectrum", "title": "The electromagnetic spectrum & modulation (radio to gamma, one axis)", "shelf": "theories", "surface": "secular", "snippet": "The electromagnetic spectrum & modulation (radio to gamma, one axis) — an engine domain that can touch it: physics. Calibration: seals — c = fλ, photon energy E = hf, and bandwidth relations all recom", "authority_tier": "reference", "source": "The Theory Assay — calibrated, not judged (docs/THEORY_CATALOG.md)", "readable": false, "generated": false}, {"id": "card_n_cdb747a427d2", "title": "Electronics — the resonant chain, from Ohm's law to the radio wave", "shelf": "science", "surface": "secular", "snippet": "One sealed chain runs the whole bench: Ohm's law (V = I·R), the capacitor's\nexponential clock (one time constant → 63.2% charged), the diode's exponential gate (current\ndoubles every ln2·nVT ≈ 17.9 mV", "authority_tier": "engine_derived", "source": "Concordance assay — 2026-07-09", "readable": false, "generated": false}, {"id": "card_n_c39a51a03b6f", "title": "Oscillator — LC resonance, the bench's own Schumann", "shelf": "science", "surface": "secular", "snippet": "Energy sloshing between a coil and a capacitor rings at f = 1/(2π√(LC)); sealed:\n100 µH with 100 pF gives 1.591 MHz — the middle of the AM broadcast band: https://narrowhighway.com/s/1ee0d3ed486453eee", "authority_tier": "engine_derived", "source": "Concordance assay — 2026-07-09", "readable": false, "generated": false}, {"id": "card_n_8fc4ffc7fb8f", "title": "Revelation 22", "shelf": "codex", "surface": "witness", "snippet": "1. He showed me a river of water of life, clear as crystal, proceeding out of the throne of God and of the Lamb,\n2. in the middle of its street. On this side of the river and on that was the tree of l", "authority_tier": "scripture", "source": "World English Bible · Revelation 22", "readable": false, "generated": false}, {"id": "card_n_9d42516b140c", "title": "Quartz at 32,768 Hz — a power of two on the wrist", "shelf": "science", "surface": "secular", "snippet": "Every quartz watch cuts a tuning fork to hum at exactly 2^15 = 32,768 Hz, sealed, and\n32768 / 2^15 = 1: run the signal through fifteen binary flip-flops, each halving the frequency,\nand the last ticks", "authority_tier": "engine_derived", "source": "Concordance assay — 2026-07-09", "readable": false, "generated": false}, {"id": "card_src_book_26622", "title": "How to Read the Crystal; or, Crystal and Seer — Sepharial", "shelf": "gutenberg", "surface": "secular", "snippet": "How to Read the Crystal; or, Crystal and Seer, by Sepharial. Subjects: Crystal gazing. Read the full text (public domain): https://www.gutenberg.org/ebooks/26622", "authority_tier": "reference", "source": "Project Gutenberg (public domain)", "readable": true, "generated": false}, {"id": "card_src_book_44192", "title": "The Crystal Palace — Peter Berlyn", "shelf": "gutenberg", "surface": "secular", "snippet": "The Crystal Palace, by Peter Berlyn. Subjects: Crystal Palace (Great Exhibition, 1851, London, England). Read the full text (public domain): https://www.gutenberg.org/ebooks/44192", "authority_tier": "reference", "source": "Project Gutenberg (public domain)", "readable": true, "generated": false}, {"id": "card_src_book_53934", "title": "The Sabbath and the Crystal Palace — Anonymous", "shelf": "gutenberg", "surface": "secular", "snippet": "The Sabbath and the Crystal Palace, by Anonymous. Subjects: Sunday; Sabbath; Crystal Palace (Sydenham, London, England). Read the full text (public domain): https://www.gutenberg.org/ebooks/53934", "authority_tier": "reference", "source": "Project Gutenberg (public domain)", "readable": true, "generated": false}, {"id": "card_src_book_62220", "title": "The New Crystal Palace and the Christian Sabbath — John Weir", "shelf": "gutenberg", "surface": "secular", "snippet": "The New Crystal Palace and the Christian Sabbath, by John Weir. Subjects: Sunday; Crystal Palace (Sydenham, London, England). Read the full text (public domain): https://www.gutenberg.org/ebooks/62220", "authority_tier": "reference", "source": "Project Gutenberg (public domain)", "readable": true, "generated": false}, {"id": "card_src_book_62202", "title": "The Sabbath, the Crystal Palace, and the People — James Baldwin Brown", "shelf": "gutenberg", "surface": "secular", "snippet": "The Sabbath, the Crystal Palace, and the People, by James Baldwin Brown. Subjects: Sunday; Crystal Palace (Sydenham, London, England); Sunday legislation. Read the full text (public domain): https://w", "authority_tier": "reference", "source": "Project Gutenberg (public domain)", "readable": true, "generated": false}, {"id": "card_src_book_63755", "title": "A Few Words on the Crystal Palace Question — C. J. (Charles John) Vaughan", "shelf": "gutenberg", "surface": "secular", "snippet": "A Few Words on the Crystal Palace Question, by C. J. (Charles John) Vaughan. Subjects: Crystal Palace (Sydenham, London, England); Sunday legislation -- Great Britain. Read the full text (public domai", "authority_tier": "reference", "source": "Project Gutenberg (public domain)", "readable": true, "generated": false}, {"id": "card_src_book_62203", "title": "The Divided Sabbath remarks concerning the Crystal Palace now erecting at Sydenham — William Jowett", "shelf": "gutenberg", "surface": "secular", "snippet": "The Divided Sabbath remarks concerning the Crystal Palace now erecting at Sydenham, by William Jowett. Subjects: Crystal Palace (Sydenham, London, England); Sunday legislation -- Great Britain; Sabbat", "authority_tier": "reference", "source": "Project Gutenberg (public domain)", "readable": true, "generated": false}, {"id": "card_src_book_62206", "title": "A few lines against the opening of the Crystal Palace on the Sabbath day — John Elwin Wrench", "shelf": "gutenberg", "surface": "secular", "snippet": "A few lines against the opening of the Crystal Palace on the Sabbath day, by John Elwin Wrench. Subjects: Sabbath -- Poetry; Crystal Palace (Sydenham, London, England) -- Poetry. Read the full text (p", "authority_tier": "reference", "source": "Project Gutenberg (public domain)", "readable": true, "generated": false}, {"id": "card_src_book_63257", "title": "An Apology for the Colouring of the Greek Court in the Crystal Palace — Owen Jones", "shelf": "gutenberg", "surface": "secular", "snippet": "An Apology for the Colouring of the Greek Court in the Crystal Palace, by Owen Jones. Subjects: Crystal Palace (Sydenham, London, England); Architecture, Greek; Decoration and ornament -- Greece. Read", "authority_tier": "reference", "source": "Project Gutenberg (public domain)", "readable": true, "generated": false}, {"id": "card_src_lex_g2930", "title": "G2930 — κρύσταλλος (krustallos): crystal", "shelf": "lexicon", "surface": "secular", "snippet": "κρύσταλλος (krustallos), Strong's G2930: crystal. κρύσταλλος , -ου, ὁ (κρύος, frost), [in LXX: Job.38:29 , Psa.147:17 , Eze.1:22 (קֶרַח), etc. ;] crystal : Rev.4:6 22:1 .† (AS)", "authority_tier": "reference", "source": "STEPBible TBESH/TBESG — Extended Strong's lexicon (CC-BY, Tyndale House)", "readable": false, "generated": false}, {"id": "card_src_taxon_2283136", "title": "Protocheirodon pi — mountain crystal tetra", "shelf": "taxonomy", "surface": "secular", "snippet": "mountain crystal tetra (Protocheirodon pi) — a species. In the tree of life under Protocheirodon. Also known as: mountain crystal tetra, triangle glass tetra.", "authority_tier": "reference", "source": "NCBI Taxonomy (public domain)", "readable": false, "generated": false}, {"id": "card_c_677eefd6b57a", "title": "Oscillator — LC resonance, the bench's own S ↔ Build a Crystal Radio", "shelf": "connections", "surface": null, "snippet": "This is the crystal radio's tuner and every radio's local oscillator.  — a concord the card itself states; mined + verified.", "authority_tier": "engine_derived", "source": "Concordance miner — 2026-07-11", "readable": false, "generated": false}, {"id": "card_src_book_69314", "title": "The death crystal — George O. (George Oliver) Smith", "shelf": "gutenberg", "surface": "secular", "snippet": "The death crystal, by George O. (George Oliver) Smith. Subjects: Science fiction; Adventure stories; Man-woman relationships -- Fiction; Crystals -- Fiction. Read the full text (public domain): https:", "authority_tier": "reference", "source": "Project Gutenberg (public domain)", "readable": true, "generated": false}], "house": {"door": "FIND", "kind": "cards", "trail": "results", "seal": null, "next_step": {"do": "open the top card", "door": "FIND", "tool": "card_get", "params": {"id": "card_n_072d00893a26"}}, "ends": "a verdict or a card · the trail · a seal · one next step"}}