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Report of the Bureau of Mines of the Department of Internal Affairs of ...

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No. 10. EIGHTH BITUMINOUS DISTRICT. 435<br />

was tile previous method, wliirli has one ^ood etteet, as it causes <strong>the</strong><br />

carbon dioxide given ott" in <strong>the</strong> old workings to i)ass directly into <strong>the</strong><br />

return and up <strong>the</strong> slope. Tlu' air is conducted in four splits from <strong>the</strong><br />

downcast shaft, and through tlu^ mine to <strong>the</strong> retui-n, and on my last<br />

visit, when in full operation, 40,200 cubic feet <strong>of</strong> air was measured at<br />

bottom <strong>of</strong> shaft. The improvtnneiits were: Sinking a new shaft, 8x

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