Gas Cover

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“Every retort is furnished with a seperate mouthpiece, usually of cast iron, with a socket b for receiving the stand-pipe or ascension-pipe, and there is a movable lid attached to the mouth, together with an ear-box cast on each side of the retort for receiving the ears which support the lid.” — Encyclopedia Britannica, 1893

Source

The Encyclopedia Britannica, New Warner Edition (New York, NY: The Werner Company, 1893)

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