Syringe Flashlight
The following flashlight design then works upon vacuum ( negative pressure as follows;
The plunger is pull outward with the valve from the vacuum chamber open causing vacuum in the vacuum chamber, then the valve is closed The will cause a vacuum differentiation in the two chambers ie the syringe itself and the additional vacuum chamber.
Vacuum also seeks equalibrium.The pulling of the syringe will cause greater vacuum in the syringe than in the additional vacuum chamber around the base of the flashlight. The electrical switch then connecting the voltage regulated permanent magnet dynamo to the flashlight light bulb is turned on and the valve from the additional vacuum chamber is opened allowing the higher vacuum in the syringe to seek equalibrium producing flow and rotational motion in the pneumatic impeller yielding rotation of the dynamo and ratio gear set also connected to an air pump . The air pump then is producing higher vacuum in the syringe and caused motion of the flow system.