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Galena is the crystal that is generally used, for, while it is not quite as sensitive as silicon and iron pyrites, it is easier to obtain a sensitive piece. The Tuning Coil.

Steel, the strongest of all forms of iron, is an alloy of iron and carbon, and for various purposes these are further mixed with nickel and silicas. Many other alloys have been discovered within the last few years, and each makes possible new uses for iron requiring greater strength. One of the best of these is a mixture of iron and silicon, called ferro-silicon.

We've seen hydrogen, oxygen, silicon and others, and as the sun aged, the elements must have been mixed up more and more thoroughly. Yet we have seen the vast areas of single elements. Some of those areas are so vast that they could easily be the source of an entire world!

Then in order of their weight come carbon, hydrogen, nitrogen, calcium, phosphorus, sulphur, sodium, chlorine, fluorine, potassium, iron, magnesium and silicon. Because it will be helpful in giving a better idea of the necessity for proper feeding, I shall devote a few words to each of these elements.

Garland himself had assisted in repairing before the proceedings began. A silicon book-slate, eight inches by five inches. There were six pages the insides of the covers and a double leaf. These leaves lay close and flat, like those of a book. A few bits of slate-pencil, from one-quarter of an inch to three-eighths of an inch in length; also a longer slate-pencil used by the writer.

Silicon bronze wire is stronger than copper wire and should be used where aerials are more than 100 feet long, while phosphor bronze wire is the strongest aerial wire made and is used for high grade aerials by the commercial companies and the Government for their high-power stations.

Pig-iron contains silicon, sulphur and phosphorus, and these impurities make it brittle so that a cast iron teakettle will break at a blow, like a china cup. Armor of this kind would have been no good for our iron-clad ancestors.

Two hundred carbon-lines were, through his comparisons, sifted out from sunlight, and it contains others significant of the presence of silicon a related substance, and one as important to rock-building on the earth, as carbon is to the maintenance of life.

Thus, in a man weighing 154 lbs. are found, 111 lbs. oxygen gas, and 14 lbs. hydrogen gas, which, united, form water; 21 lbs. carbon; 3 lbs. 8 oz. nitrogen gas; 1 lb. 12 oz. 190 grs. phosphorus; 2 lbs. calcium, the chief ingredient of bones; 2 oz. fluorine; 2 oz. 219 grs. sulphur; 2 oz 47 grs. chlorine; 2 oz. 116 grs. sodium; 100 grs. iron; 290 grs. potassium; 12 grs. magnesium; and 2 grs. silicon.

The American dream is a song of hope that rings through night winter air; vivid, tender music that warms our hearts when the least among us aspire to the greatest things: to venture a daring enterprise; to unearth new beauty in music, literature, and art; to discover a new universe inside a tiny silicon chip or a single human cell.