Wet and Dry Moons

1910

There is an old superstition, which dies hard, that the position of the horns of the new moon tells what the weather will be; if the horns of the crescent are on the same level, it will hold water, and hence it is a dry moon; but if it is tipped up, then the water will run out, and it is a wet moon.

One thing has helped keep this belief alive; the moon is "dry" in the part of the spring that is usually fair, while it is "wet" during the season of autumn rains.

If this were a sure sign of the weather we could have our predictions years in advance, for an astronomer can predict the exact position of the moon at any time in the future.

The cause for the different positions of the crescent is simple: The moon is south of the sun in the autumn and north of it in spring. The crescent is found by the light of the sun falling on the moon, and the horns are naturally in a line perpendicular to the direction of the sun from the moon.

That is all there is to it.

Shooting Skies For Rain

1910

Uncle Sam Has Lost Faith in Rain-Making Schemes, but Italians Are Still Sanguine

Washington. — Recently when fire was sweeping over the mountains of the west, leaving death and destruction in its wake, the despairing people appealed to the war department to bombard the skies and bring a much-needed rain. For obvious reasons their request was refused. Uncle Sam, a few years ago, spent large sums of money experimenting along this line, sending up bombs and firing cannon at the skies to produce rain by artificial means. It was no use, for clouds refused to "leak" in satisfaction of man's tiny tickling. Since then the government has been without faith in any scheme for rain-making.

It is now held that the reason why rain usually followed the great battles of history is because whenever possible the commanders moved their armies and began battles when the weather was fair. Rain falls on an average of one day in three, so it is no amazing matter that the clouds should spill their contents about the time one of those famous slaughters would be over with.

Of course, the great men of science know that it is useless for man, with his puny implements, to undertake to bring about those stupendous changes in nature necessary to produce the phenomenon of rain. It would be necessary to lower the temperature of a vast area of the heavens, or saturate such a region with moisture to obtain results, and our means of accomplishment are too limited.

Though our government has lost faith in rain-making, however, the Italians seem to be quite confident that in one way, at least, bombarding the clouds is productive of good results. In all the vineyards of that sunny land there may be seen curious funnel-shaped guns pointing to the sky. Hail storms form one of the chief dangers to the grape crop in that country, and the Italians believe that the firing of these guns prevents such destructive visitations by dissipating the clouds which give them birth.

The Influence of Man Upon Climate

1877

The influence of man upon climate has been a favorite subject of late years, and it is now well known that, by cutting down forests and draining the soil, men can materially change the climate of a country.

Some recent experiments conducted in Germany confirm this belief, by showing the extent to which woods will affect the rainfall. Two observatories were established for the purposes of comparison — one over a clump of trees forty feet high, and the other over a bare sandy plain about three hundred yards from the forest. Both observatories, were built at the same height from the ground. Twelve months' observation showed that of the total rainfall within that period ten per cent more rain fell over the trees than over the bare sand distant three hundred and thirty yards from them. Further, the air above the wood was charged with aqueous vapor to the extent of ten percent in excess of the air over the barren open soil. The ground too, under the trees, retained far more water than the exposed earth, evaporation from the surface, thanks to its shade of trees and moss, being only one-sixth of that outside their friendly shelter.

These results are valuable in that they point out a possible means of improving the condition of sterile tracts, i.e., by planting trees.