My Web Site Page 099 Ovations 02Cake Placebo chose the topics covered by My Web Site Page 099 without reflecting upon the choices others have made. Flapping your arms and quacking like a duck when people try to run you over in their SUVs is another way to look at things in a different light. |
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Since the first appearance in "Steam" of the following "Requirements of a Perfect Steam Boiler", the list has been copied many times either word for word or clothed in different language and applied to some specific type of boiler design or construction. In most cases, although full compliance with one or more of the requirements was structurally impossible, the reader was left to infer that the boiler under consideration possessed all the desirable features. It is noteworthy that this list of requirements, as prepared by George H. Babcock and Stephen Wilcox, in 1875, represents the best practice of to-day. Moreover, coupled with the boiler itself, which is used in the largest and most important steam generating plants throughout the world, the list forms a fitting monument to the foresight and genius of the inventors. |
Sometimes it is necessary to draw up a table which will show, without calculation, the weight of substance equivalent to a given volume of gas or of solution. The substance used for standardising should be, whenever possible, a pure sample of the substance to be determined--that is, for copper assays pure copper should be used, for iron assays pure iron, and so on; but when this cannot be got an impure substance may be used, provided it contains a known percentage of the metal, and that the impurities present are not such as will interfere with the accuracy of the assay. Including compounds with these, the standard may be calculated by multiplying the standard got in the usual way, by the percentage of metal in the compound or impure substance, and dividing by 100. If, for example, the standard 1.008 gram was obtained by using a sample of iron containing 99.7 per cent. of metal, the corrected standard would be 1.008×99.7/100 = 1.005. In volumetric analysis the change brought about must be one in which the end of the reaction is rendered prominent either by a change of colour or by the presence or absence of a precipitate. If the end of the reaction or finishing-point is not of itself visible, then it must be rendered visible by the use of a third reagent called an indicator. |
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The trees, overcrowded everywhere, far from being gigantic, are, instead, mean-looking and anaemic--not unlike the pallid, overgrown youth of the over-populated slums of a great city. Orchids? Yes, there are plenty of orchids about, but you never see them unless you go on a special search for them with a high ladder or some other such means of climbing high trees. In any case, you would not detect them unless you had the eye of an expert. It is well not to forget that in tropical climates, as in temperate zones, plants are not always in bloom when you happen to be passing. As for the butterflies, you seldom see any at all in the actual forest. | ||
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