| 摘要 |
A cigarette holder or tobacco pipe having a transverse bore in the stem portion that is in communication with atmosphere. A port-type valve system is included in the stem portion and includes a pair of threaded portions connecting axially arranged members, the members having transverse or radial bores therein and having annular chambers communicating with selected bores whereby rotation of said members relative to each other will move one axially with respect to the other and place portions of said transverse bores in communication with said chambers whereby smoke passing through the device may be mixed with air in a ratio between zero and a maximum. The bores etc., are sized so that the effective draw may not be altered upon a change in said ratio. The valve system is connected with ducts leading thereto from the tobacco holding portion and from the mouthpiece end of the device.
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