Abstract: A volumetric flow gauge is provided for use particularly with ambulatory oxygen users who receive oxygen on a continuous or semi-continuous basis from an oxygen tank communicating to the patient through a line terminating in a two-tip nasal cannula, the two tips of which projects into the nostrils. The gauge comprises an upright indicator portion, having a hollow tube with a floating ball inside elevationally responsive to the upwardly directed volumetric flow of gas inside, and an integral plug spaced from the gas fitting from the indicator which plugs the second cannula tip, while the first tip receives and gauges the flow of oxygen therethrough.

Abstract: The invention is a support which can be releasably attached to a table, or the like, and which extends across the table to support the forehead of a person who is leaning over the table engaged in work such as drafting, reading fine print or the like. The device is triply adjustable to conform to the position of the forehead and to swing out of the way when not in use.

Abstract: A convenient tray is provided for a wheelchair wherein the tray retracts onto a housed roll mounted beneath one armrest of a conventional wheelchair and extends across the lap of the wheelchair victim to be engaged by a releasable catch mechanism beneath the opposite armrest. The sheet material of which the tray is made has a transverse upwardly convex arch over its length to provide it with rigidity when it is extended in the manner conventionally subscribed to by tape measures, this sheet becoming flexible in the longitudinal direction for rolling when the sheet is retracted onto its roller.