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I struggled up on my feet and proceeded to carry the big vessels to the river bank, where I intended to construct the raft. The effort to take each heavy bottle those few metres seemed almost beyond me in my exhausted state. At last I proceeded to strip the floor of the hut, which had been made with split _assahy_ palms (_Euterpe oleracea_ L.), in order that I might make a frame to which I could fasten the bottles. With a great deal of persuasion I got Filippe and Benedicto to help me. The long pieces of _assahy_ were too heavy for our purpose, and we had the additional trouble of splitting each piece into four. It was most trying work in our worn-out condition. Then we had to go into the forest and collect some small liane, so that we could tie the pieces together, as we had no nails and no rope. |
There are other ores which are not apparently wet, but in the state called "air-dried." It is easier to take fair samples of these, and, consequently, it is not necessary to use so large a quantity as 20 grams. But with a smaller quantity, extra precautions must be taken. All dry solids at ordinary temperatures absorb moisture from the air. The amount varies with the nature of the material and with the quantity of surface exposed. Light bulky powders absorb more than heavy ones, because of the greater condensing surface. It is on this account that it is well to weigh substances, which have been dried, between close-fitting watch-glasses. The method of determining moisture is to weigh out into the glasses 5 grams of ore, and dry in the water-oven until there is no further loss of weight. On taking the glasses out of the oven, they should be at once closed, the clip put on, and after cooling in a desiccator weighed. If after a second trial the loss is the same, or only increased by a milligram, the determination is finished. |
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