{"query": "Resonators — Helmholtz, the cavity, Fabry-Perot: one shape,", "count": 7, "results": [{"id": "card_tool_resonators", "title": "Resonators — Helmholtz, the cavity, Fabry-Perot: one shape, a Q that fades", "shelf": "codex", "surface": "secular", "snippet": "Three instruments, one shape. The HELMHOLTZ RESONATOR (1863) is a volume of air on a neck - the air in the neck is the mass, the air in the body the spring - f = (c/2 pi) sqrt(A/(V L')), the lumped li", "authority_tier": "engine_derived", "source": "Narrow Highway — the instruments", "readable": false, "generated": false}, {"id": "card_src_word_helmholtz", "title": "helmholtz", "shelf": "dictionary", "surface": "secular", "snippet": "helmholtz: (noun) German physiologist and physicist (1821-1894) — syn: Hermann von Helmholtz, Hermann Ludwig Ferdinand von Helmholtz, Baron Hermann Ludwig Ferdinand von Helmholtz", "authority_tier": "reference", "source": "WordNet 3.0, Princeton University (WordNet License)", "readable": false, "generated": false}, {"id": "card_src_word_hermann_von_helmholtz", "title": "hermann von helmholtz", "shelf": "dictionary", "surface": "secular", "snippet": "hermann von helmholtz: (noun) German physiologist and physicist (1821-1894) — syn: Helmholtz, Hermann Ludwig Ferdinand von Helmholtz, Baron Hermann Ludwig Ferdinand von Helmholtz", "authority_tier": "reference", "source": "WordNet 3.0, Princeton University (WordNet License)", "readable": false, "generated": false}, {"id": "card_src_word_hermann_ludwig_ferdinand_von_helmholtz", "title": "hermann ludwig ferdinand von helmholtz", "shelf": "dictionary", "surface": "secular", "snippet": "hermann ludwig ferdinand von helmholtz: (noun) German physiologist and physicist (1821-1894) — syn: Helmholtz, Hermann von Helmholtz, Baron Hermann Ludwig Ferdinand von Helmholtz", "authority_tier": "reference", "source": "WordNet 3.0, Princeton University (WordNet License)", "readable": false, "generated": false}, {"id": "card_src_word_baron_hermann_ludwig_ferdinand_von_helmholtz", "title": "baron hermann ludwig ferdinand von helmholtz", "shelf": "dictionary", "surface": "secular", "snippet": "baron hermann ludwig ferdinand von helmholtz: (noun) German physiologist and physicist (1821-1894) — syn: Helmholtz, Hermann von Helmholtz, Hermann Ludwig Ferdinand von Helmholtz", "authority_tier": "reference", "source": "WordNet 3.0, Princeton University (WordNet License)", "readable": false, "generated": false}, {"id": "card_seal_e47394263d2549a271fe50bad838804e34fde2fb6bb16768434a9bb113c5ea1b", "title": "Receipt e47394263d25… — sealed: record", "shelf": "seals", "surface": "secular", "snippet": "{\n \"anchors\": [],\n \"axis_coords\": {\n  \"axis\": \"mathematics\",\n  \"dimensions\": [\n   \"reasoning\"\n  ]\n },\n \"gate_results\": [\n  {\n   \"details\": {\n    \"broken_at\": null,\n    \"confirmed_steps\": 1,\n    \"error", "authority_tier": "engine_derived", "source": "Narrow Highway engine — sealed record", "readable": false, "generated": false}, {"id": "card_src_book_77725", "title": "Popular lectures on scientific subjects — Hermann von Helmholtz", "shelf": "gutenberg", "surface": "secular", "snippet": "Popular lectures on scientific subjects, by Hermann von Helmholtz. Subjects: Science; Universities and colleges -- Germany. Read the full text (public domain): https://www.gutenberg.org/ebooks/77725", "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_tool_resonators"}}, "ends": "a verdict or a card · the trail · a seal · one next step"}}