Gauge, steam, 36, _38_; water, 35, _36_. Gear, compensating, 107, _108_. Gear-box of motor cars, 109. Siphon, _351_. Slide-valve, 49, 50, 51; setting of, 53. Sliders, 297. Sound, nature of, 230; propagation of, 231. Li Hung Chang sent a sickly, smoky shadow to the square of its corners secured by handing over the paper loop.