Fig. 3
From: Prototyping a thermal walker that can walk on a hot horizontal surface with a simple gait
![Fig. 3](http://media.springernature.com/full/springer-static/image/art%3A10.1186%2Fs40648-018-0113-y/MediaObjects/40648_2018_113_Fig3_HTML.png)
(From [8], ©2015 IEEE)
Walking principle. a Walker stands upright on a hot surface, b right leg is lifted up and the leg behaves as a pendulum. Left leg supports the body, c the body swings back toward upright posture, d swing leg lands on the hot surface, e legs switch their roles