Spectacle

{
  "id": "MLC-T-IND-005508",
  "term": "Spectacle",
  "field": "Industrial and trades",
  "definition": "The part of a railway semaphore signal arm that holds colored glass lenses, which are displayed in front of a lamp at night to indicate the signal aspect. When the arm moves, the spectacle rotates, bringing a different colored lens into alignment with the light source. Red indicates stop, and green or white indicates clear, depending on the specific signalling system.",
  "synonyms": [
    "glasses",
    "eyeglasses",
    "specs"
  ],
  "subject": "Rail equipment",
  "translations": {
    "de": "Farblinsenrahmen",
    "es": "espectáculo",
    "fr": "lunette"
  },
  "url": "https://mlchart.com/terminology/industrial/spectacle/"
}