| 摘要 |
A pressure gauge including indicating means and pressure sensing means, the indicating means including an opaque screen and an indicator dial which are relatively movable, the screen and dial being relatively moved along a path of movement between first and second limits of movement in a progressive manner in response to variation of pressure sensed by the sensing means, the screen being arranged to mask the dial from view and being provided with a window through which a portion of the dial can be viewed during said relative movement along said path, the dial having two visibly distinct regions on its surface which is visible through the window, the visibly distinct regions being juxtaposed to one another along the path of movement, a first of said regions being arranged to be in registry with the window when the pressure sensed by the sensing means is at or above a first predetermined pressure and a second of said regions being arranged to be inregistry with the window when the pressure sensed by the sensing means is at or below a second predetermined pressure which is lower than the first predetermined pressure.
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