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Updated: May 12, 2025
Hydrogen, helium, and calcium form, then, the chief and unvarying materials of the solar sierra and its peaks; but a number of metallic elements make their appearance spasmodically under the influence of disturbances in the layers beneath.
The play, and nothing but the play was certainly the thing; the hapless stranger was buffetted in a maelstrom of theatrical activity. The very air reeked of calcium and grease paint. The sidewalks were crowded with actors of all ages, some smartly dressed, others seedy-looking and down at heel.
His computations for the Porters black loam gave the following results: 4,630 pounds of phosphorus 48,300 pounds of potassium 12,360 pounds of magnesium 23,700 pounds of calcium He viewed these figures a moment with evident satisfaction. "Plenty of everything in this wonderful 'pippin land," he thought. "Big yields reported for everything suited to that altitude.
At the other end of the spectroscope is the photographic plate. Just in front of this plate there is another slit parallel to the first, in the position where the image of the first slit formed by the K line of calcium falls. Thus is obtained a photograph of the section of the sun, made by the first slit, only in K light.
If a bone is soaked in an acid, the mineral matter is dissolved out, and as a result it loses its properties of hardness and stiffness. The chief materials forming the mineral matter are calcium phosphate and calcium carbonate. On the other hand, burning a bone destroys the animal matter. When this is done the bone loses its toughness, and becomes quite brittle.
Considered as mere curiosities, these discoveries were interesting, but aside from that they were of great theoretical importance, because they showed the compound nature of some familiar chemicals that had been regarded as elements. Several other elementary earths met the same fate when subjected to the electrical influence; the metals barium, calcium, and strontium being thus discovered.
They were much more interesting to Brown, however, than anything he had ever seen in the set and artificial radiance of the calcium light. He knew well every face there, and yet, after his year's exile and in contrast to the faces at which he had been lately looking, they formed a more engrossing study than any he had known for many months.
You will have gums and resins from the wood, calcium chloride from the bleach vats, acids from the "sours"; resin, and resin-soaps; there may also be alumina salts present. Now alumina, lime, resin, and resin-soaps, etc., precipitate dyestuffs, and also soap; if the water is alkaline, some of the mordants used may be precipitated and wasted, and very considerable damage done.
In 1896, something like a year after the discovery of the X-ray, Niewenglowski reported to the French Academy of Sciences that the well-known chemical compound calcium sulphide, when exposed to sunlight, gave off rays that penetrated black paper.
Most limestones contain some percentage of magnesium, and in the case of a pure dolomite over 45% carbonate is present in combination with calcium carbonate. A stone rich in magnesium slakes less readily than one high in calcium, and therefore is preferred by manufacturers shipping pulverized burnt lime to reach its destination before slaking. Relative Values.
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