He showed that a heavier-than-air machine would sustain itself in the air if it could only be driven fast enough.
heavier-than-air machines have gradually popularized flying.
But what would you think if I told you that there is not an ounce of gasoline in my heavier-than-air craft?
Not until the twentieth century did the advocates of the heavier-than-air machines show the value of their fundamental idea.
Wood is not employed in the construction of these heavier-than-air craft.
On his return to Paris he at once began experimenting with heavier-than-air machines.
For years inventors studied ways of making a heavier-than-air machine sail through the sky like a bird.
Wright were experimenting with heavier-than-air machines, but general interest in the subject is quite recent.
In the duty of reconnoitring the dirigible possesses one great advantage over its heavier-than-air rival.
"Well, my father had worked for years perfecting the plans of a heavier-than-air flying machine," Morris resumed.