. Discovery reports. Discovery (Ship); Scientific expeditions. 220 DISCOVERY REPORTS in boxes which were always kept right end uppermost. The long tubes were used for many animals, but more particularly for Alcyonaria, Crinoids, large worms and deep- sea fishes. Seven standard sizes of bottles were carried, the types being those shown in Fig. 33. Most in demand were the four kinds with screw tops {a-d), which have capacities respectively of i lb., 2 lb., 3 lb. and 5 lb. These have a rubber washer and glass lid kept tight by a screw ferrule and are similar to those used for preserving fruit. Th
. Discovery reports. Discovery (Ship); Scientific expeditions. 220 DISCOVERY REPORTS in boxes which were always kept right end uppermost. The long tubes were used for many animals, but more particularly for Alcyonaria, Crinoids, large worms and deep- sea fishes. Seven standard sizes of bottles were carried, the types being those shown in Fig. 33. Most in demand were the four kinds with screw tops {a-d), which have capacities respectively of i lb., 2 lb., 3 lb. and 5 lb. These have a rubber washer and glass lid kept tight by a screw ferrule and are similar to those used for preserving fruit. The Fig. 33. Bottles used for the storage of zoological material. which are ordinarily made of lacquered tin plate and rust rapidly under sea-going con- ditions, were specially manufactured in copper. In the bottle shown in Fig. 33 e, which was used mainly for large samples of plankton and for the preservation of fine material obtained in small nets attached to the trawl, the glass lid is kept in position by a simple but very eflFective spring clip made of galvanized wire. This type, if made in a sufficient range of sizes, and with larger lids, would be ideal for biological pur- poses. Bottles / and g have glass lids and rubber washers like the others, and in the middle of the lid a recessed perforation covered by a circular glass disc resting on a small rubber washer. The bottle is made tight by means of a small exhaust pump h placed over the centre of the lid: when this pump is used the glass disc forms a non- return valve and a partial vacuum is created inside. These bottles were stocked not because the vacuum device was thought an advantage, but because their shapes rendered them particularly valuable for biological work. Fish nearly 10 in. in length can be put in one of them, while the other, with a mouth more than 5 in. in diameter,. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - color
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Keywords: ., bookcentury1900, bookdecade1920, booksubjectscientificexpedition
