Ink Vent
A rather obscure 19th century invention. The text is from an old library technology catalog.
Ink Vents. This device removes the annoyance and danger of filling inkstands and wells from large bottles ; e. g. the cork of the quart bottle is replaced by the Vent. If a nose is cut into the bottle, put a bit of folded paper in it before pressing the Vent cork into place, where it remains till the bottle is empty and the Vent wanted for a new one. Besides the convenience, the saving of a single stain pays many times the trifling cost.
This style is perfectly air tight and admits of pouring into the smallest opening without spilling a drop. The fore-finger pressed over the air vent regulates the flow, so that overflowing, dripping, etc., are entirely avoided









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