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Study for lifting considerably heavy objects
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Inclinometer - used to show position in flight
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Lifebouy and diving device
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Flywheel
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Night clock
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Single wing - study from bird anatomy
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Flying machine
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Jakscrew
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Boat with a double hull - long before titanic
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Multi speed windlass - for lifting objects at different velocities
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Transmission of motion to an axle - actually the hinese already had one of these in their distance measurers
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The parachute - did it work?
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Glider with manouverable wing extremities - a hang glider?
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Gear shift - long before the car
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Navel cannon
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Excavating machine
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Catapault
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The air screw (helicopter)
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Study for lifting considerably heavy objects
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Automatic roasting spit
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Crane on a circular platform
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Archemides screw
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Navel tank
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Hydraulic drill
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Floodlight
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Autolock mechanism
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Hammer driven electric cam
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Ball bearing
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Hydraulic saw
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Paddle vessel