Post Office Edinburgh and Leith directory . 921. EXPLANATION OP VERTICAL SECTION.(.Wot Full She.) The Governor is set tomeet all ordinary pressure;but to regulate it for veryhigh or low pressure, itonly requires A to be un-screwed from B, and theplate C screwed a little upto decrease the light, anddown to increase it; thisbeing done by the Fitterwhen first applied, will notrequire any further atten-tion.

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