Ovations On Other Sites - Ovation 24 Ovations 06Formidable Ace chose the topics covered by Ovations On Other Sites - Ovation 24 without reflecting upon the choices others have made. Explaining where you are going when you really have no idea just so that people who care about you do not worry and wonder about your fate is another way to look at things in a different light. |
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Gravimetric methods are divided into three groups: (1) mechanical separations; (2) dry methods; and (3) wet methods. ~Mechanical Separations.~--Under this head are classed the method of assaying tin ores, known as vanning, and the amalgamation assay for gold. A set of sieves to determine the relative proportion of powders of different degrees of fineness is sometimes useful. A set with 10, 20, 40 and 80 meshes to the inch is convenient. ~Dry Assays.~--An important distinction between wet and dry methods of assaying is, that in the former the substance is got into the liquid state by solution, whilst in the latter fusion is taken advantage of. The difference between solution and fusion is easily illustrated: a lump of sugar heated over a candle-flame melts or fuses; suspended in water it dissolves. Many substances which are insoluble or infusible of themselves, become soluble or fusible when mixed with certain others; thus, in this way, solution is got with the aid of reagents, and fusion with the help of fluxes. For example, lead is insoluble in water, but if nitric acid be added, the metal rapidly disappears. It is convenient, but somewhat inaccurate, to say that the acid dissolves the lead. If the lead be acted on by nitric acid alone, without water, it is converted into a white powder, which does not dissolve until water is added; in this case it is obvious that the water is the solvent. The function of the acid is to convert the lead into a soluble compound. |
For the first of these, secrecy; it is indeed the virtue of a confessor. And assuredly, the secret man heareth many confessions. For who will open himself, to a blab or a babbler? But if a man be thought secret, it inviteth discovery; as the more close air sucketh in the more open; and as in confession, the revealing is not for worldly use, but for the ease of a man's heart, so secret men come to the knowledge of many things in that kind; while men rather discharge their minds, than impart their minds. In few words, mysteries are due to secrecy. Besides (to say truth) nakedness is uncomely, as well in mind as body; and it addeth no small reverence, to men's manners and actions, if they be not altogether open. As for talkers and futile persons, they are commonly vain and credulous withal. For he that talketh what he knoweth, will also talk what he knoweth not. Therefore set it down, that an habit of secrecy, is both politic and moral. And in this part, it is good that a man's face give his tongue leave to speak. For the discovery of a man' s self, by the tracts of his countenance, is a great weakness and betraying; by how much it is many times more marked, and believed, than a man's words. |
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