Gas Washing Bottle: a Single-Neck Bottle Made into a Safety Wash-Bottle (Gattermann, 1901)

A gas washing bottle that cannot suck back. A plain single-neck bottle is closed with a two-hole cork: through one hole a wide straight tube, and through it a narrow delivery tube bent at a right angle that reaches almost to the bottom; through the other the outlet. Gas bubbles up through the liquid (for example concentrated sulphuric acid to dry it). If the gas flow falters and the far vessel starts to suck, air enters between the two tubes and relieves it, so no liquid is drawn back. Result: a safety wash-bottle for washing or drying a gas stream. Source: L. Gattermann, The Practical Methods of Organic Chemistry (1901), pp. 344-345, Fig. 84. Unknown: sizes. Picture: the book's Figs. 82-85.