{
    "title": "Night Vision Device",
    "inventor_name": "David Gordon",
    "publication_year": 1929,
    "device_name": "Night Vision Device",
    "goal": "Increase the perceptive ability of the unaided eye by projecting a controllable spot of light into the line of vision of the other eye, allowing observation of dark scenes without a flashlight.",
    "problem_addressed": "Difficulty seeing in darkness or low-light conditions without external illumination.",
    "concept_summary": "An optical aid placed before one eye that contains a small incandescent bulb, a ground-glass diffuser, and an adjustable iris diaphragm. The bulb is powered by batteries and its intensity is controlled by a rheostat. The diffuser creates a soft spot of light that can be sized and modulated, which the user perceives with the other eye, enhancing night-vision capability.",
    "detailed_description": null,
    "category": "Optics & Photonics",
    "principles": [
        "Optical projection",
        "Diffusion through ground glass",
        "Adjustable aperture (iris diaphragm)",
        "Electrical brightness control (rheostat)"
    ],
    "scientific_domains": [
        "Optics",
        "Photometry",
        "Human vision"
    ],
    "mechanisms_of_action": [
        "Incandescent bulb illumination",
        "Ground-glass diffusion of light",
        "Iris diaphragm size variation",
        "Rheostat voltage regulation"
    ],
    "materials": [
        "Incandescent bulb (glass envelope)",
        "Ground glass plate",
        "Lens (glass)",
        "Metal casing",
        "Rheostat (resistive element)",
        "Batteries (3-volt cells)",
        "Iris diaphragm (metal/film)",
        "Opaque shutter (metal or painted material)"
    ],
    "energy_sources": [
        "Batteries"
    ],
    "inputs": [
        "Electrical power from batteries",
        "User adjustments via rheostat knob and aperture handles"
    ],
    "outputs": [
        "Diffused light spot of adjustable size and intensity",
        "Visual enhancement for the unaided eye"
    ],
    "claimed_performance": "Provides a controllable light spot that increases the perceptive ability of the opposite eye, allowing observation of night or darkened scenes without an external flashlight.",
    "experimental_evidence": null,
    "replication_status": null,
    "keywords": [
        "night vision",
        "optical aid",
        "iris diaphragm",
        "rheostat",
        "diffused light",
        "dual-eye perception"
    ],
    "related_technologies": [
        "Periscope",
        "Telescope",
        "Gun sight",
        "Dark glasses"
    ],
    "controversy_level": "low",
    "confidence_score": 0.95,
    "practicability_score": 0.7,
    "fringe_score": 0.1,
    "evidence_strength": 0.2,
    "risk_score": 0.1,
    "trl_estimate": 6,
    "source_urls": [],
    "organizations": [],
    "applications": [
        "Marine observation",
        "Air observation",
        "Underwater observation",
        "Land observation",
        "Dark interior viewing",
        "Daytime brightness enhancement",
        "Vision aid for impaired eyesight"
    ],
    "limitations": [
        "Limited by battery life and bulb brightness",
        "Manual adjustment required for aperture and intensity",
        "Potential eye strain from prolonged use",
        "Bulb and diffuser may degrade over time"
    ],
    "open_questions": [
        "How does the performance compare with modern night-vision technologies?",
        "What is the operational duration on the specified 3-volt batteries?",
        "What is the user comfort level during extended observation?"
    ],
    "red_flags": [],
    "evidence_quotes": [
        "The instrument is regulated by a rheostat controlled by batteries, and contains a bulb that gives off light to a ground glass and a hole in a film.",
        "A suitable light bulb 5 is a 2.7 type bulb energized by two 3-volt batteries and controlled by a rheostat of 30 ohms resistance.",
        "By turning quickly back and forth the spot of light may be driven the effect of a series of light impulses."
    ]
}