CHAPTER VIII.
HOW GRAIN BECOMES FLOUR.
In order to make bread, the first operation is to grind the corn, be it wheat, rye, barley, or oats, and we have already seen the rough methods used by primitive man and others to effect this; we have noted the mealing stones, the pestle and mortar, the hand quern, and the grinding of corn by the Greeks and Romans. They soon gave up man as a motive power, and substituted mules or horses; these in their time gave place to water, which is a cheap and, if there be anything like a fall, a very powerful motor—hence the mills dotted all over the country, by the side of brook or river, with their water-wheels either over or undershot Very picturesque are they mostly, and the drowsy murmur of the wheel and the gentle splashing of the water are very pleasant We are seeing the last of them; they have done their work and must be thrown aside, for no one in his senses, who had water-power, would now erect water-wheels when he could get a turbine.
As with the water-wheel, so its congener, the windmill, beloved of artists, is going. A motive power as cheap as water is the wind, but, unfortunately, it is not so reliable. It is believed that the Chinese were the first to use the wind as a motive power for mills, and we have no record as to when they were introduced into Europe; we only know they were in use in the twelfth century. As a rule, in England, windmills have four arms, or ‘whips,’ but sometimes they have six. These arms are generally covered with strong canvas, but occasionally they are covered with thin boarding; they are set at an angle, which varies according to the fancy of the miller, but the shaft to which they are attached (called the ‘wind shaft’) is invariably placed at an inclination of 10 or 15 degrees, in order that the revolving arms should clear the bottom portion of the mill.
A Post Mill.
A Water-Wheel Mill.
The oldest kind of windmill is called a post mill, because the whole structure is centred on a post, or pivot, and, when the wind shifts, the mill has to be turned bodily to meet it, by means of a long lever. The smock, or frock, windmill is an improvement upon the post mill; the building itself is stationary and permanent, but the head or cap, where is the wind shaft, rotates, and this is more easily managed.
For hundreds of years people were contented with the four and six arms to their windmills, and it was only in modern times that Messrs. J. Warner and Sons, of Cripplegate, London, patented their annular sails, which, as is plain to the meanest capacity, are vastly superior. The shutters, or ‘vanes,’ are connected with spiral springs, which keep them up to the best angle of ‘weather, for light winds. If the strength of the wind increases, the vanes give to the wind, forcing back the springs, and thus the area on which the wind acts diminishes. In addition, there are a striking lever and tackle for setting the vanes edgeways to the wind, when the mill is stopped, or a storm expected.