Artist's conception of the vertically-rising helicopter invented by Nikola Tesla

An artist's conception of the vertically-rising helicopter invented by Dr. Nikola Tesla as it would appear in flight, at rest, and taking off. At the left are the details of the mechanism as it would appear when an aviator attempts to arise or alight. Speeding up the propeller and tilting the plane, he assumes the position indicated at the right and proceeds along his flight.