Abstract: A hand held olfactory tester includes an elongated housing (12) with an opening at its forward end (30) thereof. An odorant chamber (22) located within the housing moveable axially between a forward (FIG. 4) and a backward position (FIG. 5). A wick (34) extends from the odorant chamber forwardly into a nozzle (32) carried at the forward end of the chamber. A thumb collar (24) located around the outside of the housing allows to move the odor chamber and nozzle forwardly. The forward end of the wick exposed to outside through the opening when moved forward so that vapors from the odorant can be smelled by a patient. O-rings (40, 42) seal the nozzle from the outside when in backward position to prevent vapors from escaping. An elongated spring (28) biases the odorant chamber and nozzle backwardly into its rear sealed position when the thumb collar is released.

Abstract: In xerographic reproducing apparatus using dry powdered toner, means is provided for applying a series of periodic mechanical tapping impulses to the toner dispenser to promote uniformity of toner dispensing and obtain clearer, sharper copies. The tapping means comprises a base affixed to the toner dispenser, a movable hammer for striking the base and electromagnetic means for periodically actuating the hammer to strike the base and thereby generate periodic mechanical tapping impulses which are conductively transmitted to the toner dispenser.