EXPERIMENT VI and VII.
An ounce of filing of Zinke being kept in a Bolt-head four hours over live Coals; fumes copiously were emitted out of the unstoped A∣pex of the Stem; and the whole remaining
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An ounce of filing of Zinke being kept in a Bolt-head four hours over live Coals; fumes copiously were emitted out of the unstoped A∣pex of the Stem; and the whole remaining
Zinke, and the flowers which had ascended be∣ing weighed, wanted five grains of an ounce. But four ounces of Lead being enclosed in a∣nother Retort, it was held over a fire two hours; and then the Apex which was small being sealed up, the Glass was exposed to the fire two hours longer; in which time the Sur∣face of the melted metal was dark and rugged, and Part of it was turned into a dark coloured Calx. The Lead being weighed had gained about thirteen grains in weight.