{"query": "Lenses — focusing by the thin-lens equation", "count": 20, "results": [{"id": "card_opt_lenses", "title": "Lenses — focusing by the thin-lens equation", "shelf": "codex", "surface": "secular", "snippet": "A lens focuses by 1/f = 1/do + 1/di (image at 15 cm for the sealed example); magnification is the ratio of distances. Every camera, eye and telescope is this geometry of rays. Rests on Maxwell.", "authority_tier": "engine_derived", "source": "Narrow Highway — optics", "readable": false, "generated": false}, {"id": "card_theory_depth_of_field", "title": "Depth of field & hyperfocal distance", "shelf": "theories", "surface": "secular", "snippet": "Depth of field & hyperfocal distance — an engine domain that can touch it: photography. Calibration: seals — a deterministic verifier can CONFIRM or BREAK checkable claims drawn from it, and seal them", "authority_tier": "reference", "source": "The Theory Assay — calibrated, not judged (lone-domain seeding)", "readable": false, "generated": false}, {"id": "card_src_pron_centering", "title": "centering", "shelf": "pronunciation", "surface": "secular", "snippet": "centering: pronounced (ARPABET) S EH1 N T ER0 IH0 NG. From the CMU Pronouncing Dictionary — the standard machine-readable pronunciations of North American English.", "authority_tier": "reference", "source": "CMU Pronouncing Dictionary (cmudict) — BSD-2-Clause, Carnegie Mellon", "readable": false, "generated": false}, {"id": "card_arch_5c85d6e8fddb5d7f", "title": "Practical carpentry; being a guide to the correct working and laying out of all kinds of carpenters' and joiners' work. With the solutions of the various problems in hip-roofs, Gothic work, centering", "shelf": "trades", "surface": "secular", "snippet": "Practical carpentry; being a guide to the correct working and laying out of all kinds of carpenters' and joiners' work. With the solutions of the various problems in hip-roofs, Gothic work, centering ", "authority_tier": "reference", "source": "Internet Archive — practicalcarpen00hodggoog (public domain)", "readable": true, "generated": false}, {"id": "card_span_b567f55f003f", "title": "CARPENTRY   AND    JOINERY", "shelf": "practical", "surface": "secular", "snippet": "1 \n\n\nARCH    CENTERINGS. \n\n\n283 \n\n\nas  shown  at  d  (Fig.  917).  The  geometrical \nmethod  of  doing  this  is  as  follows  : — From \nany  convenient  points  in  the  plan  of  the \nJace  of  the ", "authority_tier": "primary_pd", "source": "Cassell's carpentry and joinery", "readable": true, "generated": false}, {"id": "card_src_pd_practicalcarpen00hodggoog", "title": "Practical carpentry; being a guide to the correct working and laying out of all kinds of carpenters' and joiners' work. With the solutions of the various problems in hip-roofs, Got", "shelf": "practical", "surface": "secular", "snippet": "Practical carpentry; being a guide to the correct working and laying out of all kinds of carpenters' and joiners' work. With the solutions of the various problems in hip-roofs, Gothic work, centering ", "authority_tier": "reference", "source": "public domain (copyright expired)", "readable": true, "generated": false}, {"id": "card_src_port_tcp_2999_remoteware_un", "title": "Port 2999/tcp — remoteware-un", "shelf": "networking", "surface": "secular", "snippet": "Port 2999/tcp is assigned to remoteware-un: RemoteWare Unassigned.", "authority_tier": "reference", "source": "IANA Service Name and Port Number Registry (public domain)", "readable": false, "generated": false}, {"id": "card_src_port_tcp_3000_remoteware_cl", "title": "Port 3000/tcp — remoteware-cl", "shelf": "networking", "surface": "secular", "snippet": "Port 3000/tcp is assigned to remoteware-cl: RemoteWare Client.", "authority_tier": "reference", "source": "IANA Service Name and Port Number Registry (public domain)", "readable": false, "generated": false}, {"id": "card_src_port_tcp_3002_remoteware_srv", "title": "Port 3002/tcp — remoteware-srv", "shelf": "networking", "surface": "secular", "snippet": "Port 3002/tcp is assigned to remoteware-srv: RemoteWare Server.", "authority_tier": "reference", "source": "IANA Service Name and Port Number Registry (public domain)", "readable": false, "generated": false}, {"id": "card_src_port_udp_2999_remoteware_un", "title": "Port 2999/udp — remoteware-un", "shelf": "networking", "surface": "secular", "snippet": "Port 2999/udp is assigned to remoteware-un: RemoteWare Unassigned.", "authority_tier": "reference", "source": "IANA Service Name and Port Number Registry (public domain)", "readable": false, "generated": false}, {"id": "card_src_port_udp_3000_remoteware_cl", "title": "Port 3000/udp — remoteware-cl", "shelf": "networking", "surface": "secular", "snippet": "Port 3000/udp is assigned to remoteware-cl: RemoteWare Client.", "authority_tier": "reference", "source": "IANA Service Name and Port Number Registry (public domain)", "readable": false, "generated": false}, {"id": "card_src_port_udp_3002_remoteware_srv", "title": "Port 3002/udp — remoteware-srv", "shelf": "networking", "surface": "secular", "snippet": "Port 3002/udp is assigned to remoteware-srv: RemoteWare Server.", "authority_tier": "reference", "source": "IANA Service Name and Port Number Registry (public domain)", "readable": false, "generated": false}, {"id": "card_src_etym_direction", "title": "direction", "shelf": "etymology", "surface": "secular", "snippet": "direction: etymology (Webster 1913) — n.: [L. directio: cf. F. direction.]. From Webster's Revised Unabridged Dictionary (1913), public domain.", "authority_tier": "reference", "source": "Webster's Revised Unabridged Dictionary (1913), Project Gutenberg eBook #29765 — public domain", "readable": true, "generated": false}, {"id": "card_theory_nuclear_decay_binding_energy", "title": "Nuclear decay & binding energy", "shelf": "theories", "surface": "secular", "snippet": "Nuclear decay & binding energy — an engine domain that can touch it: nuclear_physics. Calibration: seals — half-lives, decay chains and mass-energy conversions compute. An unstable nucleus decays with", "authority_tier": "reference", "source": "The Theory Assay — calibrated, not judged (docs/THEORY_CATALOG.md)", "readable": false, "generated": false}, {"id": "card_theory_conservation_of_energy", "title": "Conservation of energy (1st law of thermodynamics)", "shelf": "theories", "surface": "secular", "snippet": "Conservation of energy (1st law of thermodynamics) — an engine domain that can touch it: thermodynamics. Calibration: seals. Energy is neither created nor destroyed, only converted. ΔU = Q - W: the ch", "authority_tier": "reference", "source": "The Theory Assay — calibrated, not judged (docs/THEORY_CATALOG.md)", "readable": false, "generated": false}, {"id": "card_theory_linear_algebra", "title": "Linear algebra (vector spaces, eigenvalues)", "shelf": "theories", "surface": "secular", "snippet": "Linear algebra (vector spaces, eigenvalues) — an engine domain that can touch it: linear_algebra. Calibration: seals. Vectors, the linear maps between them, and matrices as those maps written down. Th", "authority_tier": "reference", "source": "The Theory Assay — calibrated, not judged (docs/THEORY_CATALOG.md)", "readable": false, "generated": false}, {"id": "card_nav_take_bearing", "title": "Taking and following a bearing", "shelf": "navigation", "surface": "secular", "snippet": "A BEARING (azimuth) is a direction in degrees, 0°/360° = north, 90° = east, 180° = south, 270° = west. To take one to a landmark: point the direction-of-travel arrow at it, turn the bezel until its ne", "authority_tier": "reference", "source": "U.S. Army FM 3-25.26 — Map Reading and Land Navigation (public domain)", "readable": false, "generated": false}, {"id": "card_sys_entropy_arrow", "title": "The arrow of time — the root of every one-way form", "shelf": "systems", "surface": "secular", "snippet": "Why can any path run one way and not the other? Because the world itself does. The second law of thermodynamics: in an isolated system entropy does not spontaneously decrease (dS ≥ 0) — heat flows hot", "authority_tier": "reference", "source": "The recurring form — the system analogies (standard engineering) + the design they witness to", "readable": false, "generated": false}, {"id": "signpost_torah_structure_covenant_sequence_to_new_covenant", "title": "The Torah mapped structurally -- a sequence of covenants; the Law as DIRECTION (torah from yarah, 'to aim'); the covenant a CUT in blood; the new covenant written on the heart", "shelf": "signposts", "surface": "secular", "snippet": "The Torah is structurally a SEQUENCE OF COVENANTS, not a flat rulebook -- and its own key words say so. TORAH (H8451) derives from YARAH (H3384, 'to throw/shoot/point/aim/teach'): its root sense is DI", "authority_tier": "reference", "source": "Signposts among the nations — parts of the story, and the hole Christ filled (Genesis 11; Hebrews 1:1-2; Acts 17)", "readable": false, "generated": false}, {"id": "card_nav_compass", "title": "The compass — magnetic north vs true north", "shelf": "navigation", "surface": "secular", "snippet": "A compass needle points to MAGNETIC north, which differs from TRUE (map) north by an angle called DECLINATION — printed on the map's margin, and different for every region and slowly changing. To be a", "authority_tier": "reference", "source": "U.S. Army FM 3-25.26 — Map Reading and Land Navigation (public domain)", "readable": false, "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_opt_lenses"}}, "ends": "a verdict or a card · the trail · a seal · one next step"}}