Making Special Arrangements Quickly | My Web Site Page 120Calibrated Errand chose the topics covered by Making Special Arrangements Quickly | My Web Site Page 120 without reflecting upon the choices others have made. Incorporating different expressions of woe and anxiety into your happiest songs and letting people share them freely is another way to look at things in a different light. |
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Silica itself, and the silicates of alumina, of lime, and of magnesia, are practically infusible; the silicates of soda, of potash, and of iron are easily fusible if the base (soda, potash, or oxide of iron) be present in sufficient quantity, and if, in the case of the iron, it is present mainly as lower oxide (ferrous silicate). The addition of lime, oxide of iron, or alkali to silicate of alumina results in the formation of a double silicate of alumina and lime, or of alumina and iron, &c., all of which are easily fusible. Similarly, if to a silicate of lime we add oxide of iron, or soda, or even alumina, a fusible double silicate will be formed. Thus lime, soda, oxide of iron, and clay, are _fluxes_ when properly used; but since lime, clay (and oxide of iron if there be any tendency to form peroxide), are of themselves infusible, any excess of these fluxes would tend to stiffen and render pasty the resulting slag. So, too, soda, which is a very strong base, may act prejudicially if it be in sufficient excess to set free notable quantities of lime and magnesia, which but for that excess would exist in combination as complex fusible silicates. There are many minerals which with but little soda form a glass, but with more yield a lumpy scoriacious mass. There are many minerals, too, which are already basic (for example, calcite), and which, when present, demand either a less basic or an acid flux according to the proportions in which they exist. For purposes of this kind borax, or glass, or clay with more or less soda may be used, and of these borax is by far the most generally useful. An objection to too basic a slag (and a very important one) is the speed with which it corrodes ordinary crucibles. These crucibles, consisting of quartz and clay, are rapidly attacked by lime, soda and bases generally. |
The second is his universality--the word is not over-exact, but I can find no other. I mean that Froude was the exact opposite of the sciolist and was even other than the student. He was kneaded right into his own time and his own people. The arena in which he fought was small, the ideas he combated were few. He was not universal as those are universal who appeal to any man in any country. But he was eager upon these problems which his contemporaries wrangled over. He was in tune with, even when he directly opposed, the class from which he sprang, the mass of well-to-do Protestant Englishmen of Queen Victoria's reign. Their furniture had nothing shocking for him nor their steel engravings. He took for granted their probity, their common sense, and their reading. He knew what they were thinking about and therefore all he did to praise or blame their convictions, to soothe or to exasperate them, told. He could see the target. |
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