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A tubular bladder has an outside wall connected to an inside surface of a finger passage through a band of a finger ring. An inside wall of the bladder is integral with the outside wall and forms a gas chamber. A passage connects the gas chamber to a source of air. Increasing air in the gas chamber

A tubular bladder has an outside wall connected to an inside surface of a finger passage through a band of a finger ring. An inside wall of the bladder is integral with the outside wall and forms a gas chamber. A passage connects the gas chamber to a source of air. Increasing air in the gas chamber reduces the diameter of the finger passage. Reducing the quantity of air in the gas chamber increases the diameter of the finger passage. A valve can be provided to meter air into and out of the bladder. If the bladder is resilient and tends to expand the area of the gas chamber, an air passage can let air into and out of the bladder.

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A tubular bladder has an outside wall connected to an inside surface of a finger passage through a band of a finger ring. An inside wall of the bladder is integral with the outside wall and forms a gas chamber. A passage connects the gas chamber to a source of air. Increasing air in the gas chamber

A tubular bladder has an outside wall connected to an inside surface of a finger passage through a band of a finger ring. An inside wall of the bladder is integral with the outside wall and forms a gas chamber. A passage connects the gas chamber to a source of air. Increasing air in the gas chamber reduces the diameter of the finger passage. Reducing the quantity of air in the gas chamber increases the diameter of the finger passage. A valve can be provided to meter air into and out of the bladder. If the bladder is resilient and tends to expand the area of the gas chamber, an air passage can let air into and out of the bladder. d liquid is obtained by performing at least one of the following steps: before, during, or after the process of liquefying the boil-off stream, removing from the boil-off stream a predetermined amount of one or more components, such as nitrogen, having a vapor pressure greater than the vapor pressure of methane, and before, during, or after the process of liquefying the boil-off stream, adding to the boil-off stream one or more additives having a molecular weight heavier than the molecular weight of methane and having a vapor pressure less than the vapor pressure of methane.