Ovations On Other Sites - Ovation 22 Ovations 06Cake Placebo chose the topics covered by Ovations On Other Sites - Ovation 22 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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~Gasometric Assays.~--Gasometric methods are not much used by assayers, and, therefore, those students who wish to study them more fully than the limits of this work will permit, are recommended to consult Winkler and Lunge's text-book on the subject. The methods are without doubt capable of a more extended application. In measuring liquids, ordinary variations of temperature have but little effect, and variations of atmospheric pressure have none at all, whereas with gases it is different. Thus, 100 c.c. of an ordinary aqueous solution would, if heated from 10° C. to 20° C., expand to about 100.15 c.c. 100 c.c. of a gas similarly warmed would expand to about 103.5 c.c., and a fall of one inch in the barometer would have a very similar effect. And in measuring gases we have not only to take into account variations in volume due to changes in temperature and atmospheric pressure, but also that which is observed when a gas is measured wet and dry. Water gives off vapour at all temperatures, but the amount of vapour is larger as the temperature increases. By ignoring these considerations, errors of 3 or 4 per cent. are easily made; but, fortunately, the corrections are simple, and it is easy to construct a piece of apparatus by means of which they may be reduced to a simple calculation by the rule of three. The volume of a gas is, in practice, usually reduced to that which it would be at a temperature of 0° C., when the column of mercury in the barometer is 760 mm. high. But, although convenient, this practice is not always necessary. The only thing required is some way of checking the variations in volume, and of calculating what the corrected volume would be under certain fixed conditions. |
It was rather interesting to note that the formation of the right bank was exactly the same as that of the Paredao Grande we had seen in Matto Grosso. Vertical sides in great rectangles were noticeable, intersected by passages--regular canons--where small huts could be seen at the foot of the picturesque rocks, especially at places where small streamlets entered the Tapajoz. I was told that little lakes had formed beyond those frontal rocky masses, the entrances to which were blocked at low water by sand-bars. Beyond that row of vertical red rocks was a more or less confused mass of hills, some dome-like, others of a more elongated form, but still with a well-rounded sky-line. The water of the stream had now changed colour altogether, and had become of a deep green. Islets could be seen far, far away to the left side of the river, mere white dots and lines along the water-line, most of them having white sand-beaches around them; while on the right bank the great red walls in sections continued for many miles. As we neared the mouth of the Tapajoz, the river had the immense width of 14 kil. On the right, after going through the Passagem dos Surucue, we passed the mountain of Jaguarary, which stood prominent along a flat elevation on the right bank. |
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