Wakayama prefecture (和歌山県; Wakayama-ken) is part of the Kinki region on Honshu island, Japan. Wakayama prefecture is bordered by Osaka, Nara, and Mie.
... test for the presence of gases. If inflammable gas mixtures were present, the flame of the Davy lamp burned higher with a blue tinge. Miners could also place a safety ...
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