{
  "params": {
    "colour": {
      "type": "choice",
      "options": [
        "oilfield",
        "red",
        "blue",
        "green"
      ],
      "default": "oilfield",
      "label": "Colour",
      "describe": "oilfield (charcoal beam, yellow horsehead and counterweights), red, blue (white horsehead) or green (sand horsehead)."
    },
    "size": {
      "type": "range",
      "min": 0.7,
      "max": 1.4,
      "step": 0.05,
      "default": 1,
      "label": "Size",
      "describe": "Overall scale. 1 is a common 5 m tall unit; 0.7 a small stripper-well jack, 1.4 a big deep-well unit."
    },
    "drive": {
      "type": "choice",
      "options": [
        "electric",
        "engine"
      ],
      "default": "electric",
      "label": "Drive",
      "describe": "electric (motor with a belt guard and a control box on a post) or engine (gas engine with a radiator and an exhaust stack)."
    }
  },
  "presets": {
    "nodding donkey": {
      "colour": "oilfield"
    },
    "red jack": {
      "colour": "red",
      "size": 1.2,
      "drive": "engine"
    },
    "stripper well": {
      "colour": "green",
      "size": 0.75
    }
  },
  "night": {
    "lamp": {
      "zone": "lamp",
      "color": "#ffd38a",
      "intensity": 1.4,
      "describe": "The site lamp over the wellhead and the indicator on the control box glow."
    }
  }
}