1. How Trolleybus Works
System
- Power source: overhead wires with spring-loaded trolley poles
- Electric motor: the power from external source, so no need to carry heavy batteries or fuel
- Route: They are steered manually like normal buses
- If switch wrong, the trolley would jump out of the wire
Waterproof?
- The overhead wires are well-insulated and waterproofed
Switch wire?
- Manual
- Automatic: frog and driver controlled frog
- Advanced: GPS / remote control
Frog?
- Turning would result different order in 1, which would tell the system how the bus turn so it can guide the wire
2. Color Shift in Sea
Depth and composition of the seabed
- Water depth
- Shallow: light reach seabed and reflect
- Deep: less light reflect
- Composition
- Sandy: more light reflect
- Rockier or seaweed-covered: absorb more light
- Angle of the sun
- Directly overhead: lighter