Figure 1 (IMAGE)
Caption
The experiments were conducted on the famous Hong Kong Peak Tram. The device for measuring the SHV included a gravity-neutral plastic rod and wooden stand. During the experiment, observers set the rod to match their subjective vertical in the pitch plane. An iPhone installed with an app to read out the tilt was attached to the other end of the axle so the rod and digital device rotated in unison. The digital device was calibrated at the beginning of each experimental session using a plumb line and regularly re-checked throughout the experiment to ensure its accuracy.
Credit
Chia-huei Tseng
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