| 摘要 |
<p>A gas appliance such as a gas burner or gas fire, has means to vary the factors producing flames in the appliance in a substantially random or pseudo-random manner. This means can take several forms, including a 'liquid-bubbling' device (Figure 1), fan devices (Figures 2 and 3), flapper or governor valve devices (Figures 4,5 or 9), feed back devices (Figure 6) and other electrically controlled or motorised devices. <IMAGE></p> |
