You Cannot Get Away | My Web Site Page 190 Chapter 01 Page 04Formidable Ace chose the topics covered by You Cannot Get Away | My Web Site Page 190 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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In order to make things as easy as possible for them I once more rearranged the loads that afternoon, abandoning six hundred rifle cartridges, several tins of hyposulphite of soda, other chemicals, all the developing trays, etc., for my photographic work, and a number of valuable trinkets I had collected. Much to my sorrow I had also to abandon the geological collection, which was too heavy to be carried any farther. Then I had to abandon all the books which were necessary for working out my astronomical observations, such as Norrie's _Navigation_ and _The Nautical Almanac_, and all possible articles which were not absolutely necessary. |
~Filtration.~--Solutions are best filtered hot whenever the assay allows of this being so done. The precipitate should be allowed to settle, and the clear liquid decanted on the filter with the aid of a glass rod if necessary. The filter-paper must not be too large, but at the same time it must not be overloaded with the precipitate. There should be ample room for washing. For general use three sizes of filter-paper are sufficient. Common quick filtering-paper (English) is best for most work in assaying. The specially prepared paper (Swedish or Rhenish) is used for collecting those precipitates which have to be weighed. The papers are folded as shown in fig. 16, and should not project above the funnel. The filter-paper works better if damped with hot water. In special cases filtering is hastened by means of an air-pump. The apparatus used consists of a water-jet (fig. 17), which is connected with the tap, as also with a bottle fitted as shown in fig. 18. The pump draws the air out from the bottle, and atmospheric pressure forces the liquid through the filter-paper. The bottom of the funnel is provided with a platinum cone, which supports the filter-paper, and prevents its breaking. The pump is only used in exceptional cases; nearly all the filtrations required by the assayer can be made without it. The usual methods of supporting the funnel during filtration are shown in fig. 19. Where the filtrate is not wanted, pickle bottles make convenient supports. After the precipitate has been thrown on the filter, it is washed. In washing, several washings with a small quantity of water are more effective than a few with a larger quantity of that fluid. The upper edge of the filter-paper is specially liable to escape complete washing. Excessive washing must be avoided; the point at which the washing is complete is found by collecting a little of the filtrate and testing it. The precipitate is removed from the filter-paper for further treatment by opening out the paper and by washing the precipitate with a jet of water from a wash-bottle into a beaker, or back through the funnel into the flask. In some cases, when the precipitate has to be dissolved in anything in which it is readily soluble, solution is effected in the filter itself allowing the liquid to run through as it is formed. |
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These peculiarities of Dorothea's character caused Mr. Brooke to be all the more blamed in neighboring families for not securing some middle-aged lady as guide and companion to his nieces. But he himself dreaded so much the sort of superior woman likely to be available for such a position, that he allowed himself to be dissuaded by Dorothea's objections, and was in this case brave enough to defy the world--that is to say, Mrs. Cadwallader the Rector's wife, and the small group of gentry with whom he visited in the northeast corner of Loamshire. So Miss Brooke presided in her uncle's household, and did not at all dislike her new authority, with the homage that belonged to it. | ||
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