| 摘要 |
There is disclosed a dial gauge 10 comprising a dial plate 12 having a dial face 14 including angularly spaced markings 16 indicating values; a pointer 18 disposed at a front side of the dial plate 12 and angularly moveable over the dial face 14 with respect to the markings 16 so as to indicate a reading. An illumination source 20 is provided which is arranged to emit illumination light and which is disposed below the dial plate 12. The gauge further comprises a light guide 22 arranged to guide illumination light from below the dial plate 12 to the front side of the dial plate 12 so as to illuminate the dial face 14 from above. There is also disclosed a mechanical pressure gauge comprising a dial gauge 10 and a breathing apparatus comprising a cylinder of breathable gas fluidically coupled to a pressure gauge 10 which is configured to display the pressure of the breathable gas. |
