Ever since humanity has trodden upon this green, fruitful world of ours; ever since the gaze of man has turned upward and penetrated the skies, from the days of Adam and perhaps ages before that first settler made his appearance on earth, the problem of ærial navigation has agitated human breast and brain. To solve this difficult secret has long been the acme of human ambition. In 1899 we knew very little more about ærial navigation than did Noah and his family in the days when Mt. Arrarat was first used as a dry-dock.
Quite certain it is that ærial navigation ten thousand years hence will be limited to [A Limited Field After all.] a moderate elevation from the earth. Never as long as the world endures will human beings with breath in their nostrils and blood in their veins reach or travel at an altitude of over six miles above the earth's surface. We know this because death would overtake every venturesome traveler who soared into those higher regions. A thousand years hence the laws of nature will still remain immutably the same.
But the ambition of mankind is to control the air at a reasonable distance from the earth's surface and to navigate an element that is entirely free from all obstructions. The aim is to so control an ærial machine that it will not drift before every wind, but cleave the air and move along its course in defiance of the storm. To this must be added a guarantee of safety that the public is certain to exact before embarking upon an ærial voyage. Ærial navigation, no doubt, offers vast attractions but while sailing through the air, with the ease and grace of a bird, it might prove very inconvenient for passengers to fall out at a height of a mile or two and land through the roof of some peaceful, happy home or find themselves while unceremoniously falling securely hooked in the fork of a tree. Such little mishaps in ærial navigation had to be guarded against.
Ærial navigation was perfected about the [The First Airships.] year 1925. After repeated failures of the Langley system from 1896 to 1920, the learned Washington professor changed his plans. Instead of endeavoring to lift flat-irons with wings from the ground, and watching turkey buzzards at anchor in the air over the Potomac river, Langley finally created an ærial machine that was operated by electricity and moved by a large, swiftly revolving propeller, somewhat resembling those employed in steam navigation, but with blades at a more abrupt angle.