. Relazione del Commissario - Commissione americana per il pesce e la pesca . r erano magri, la prima ha sviluppato una fauna ricca e variegata. Temperature seriali e gravità specifiche sono state accuratamente prese,ma l'azione dei termometri non era del tutto soddisfacente. Kich Morking Ground è stato trovato a sud dell'isola di Coiba il 24, i soundings sviluppando un'elevazione inaspettata del seab(^ttom. Una profondità di 8(50 fathoms AVAS ha trovato 20 miglia a sud di JicaritaIsland, 701 fatlioms a 35 miglia e a 50 miglia ci era ma 465fathoms, con fondo roccioso - 1,672 fathoms che sono trovati 14 miglia

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. Report of the Commissioner - United States Commission of Fish and Fisheries . r were meager, the former developed a rich and variedfauna. Serial temperatures and specific gravities were carefully taken, but the action of the thermometers was not wholly satisfactory. Kich Morking ground was found to the southward of Coiba Island onthe 24th, the soundings developing an unexpected elevation of the seab(^ttom. A depth of 8(50 fathoms Avas found 20 miles south of JicaritaIsland, 701 fatlioms at 35 miles, and at 50 miles there was but 465fathoms, with rocky bottom—1, 672 fathoms being found 14 miles to thesouthward and westward, llocky patches were frequently encountered, especially on the submarine elevation, which played havoc with thetrawl nets, but rich hauls were made in si)ite of unfavorable conditions, and the naturalists were greatly elated over the capture of rare andvaluable si)ecimens, some of them entirely new to science. A coursewas steered in the direction of Cocos Island during the night, and at Report U. S. F. C. 1869 to 1891. (To face p. 259.) Plate 1, . INVESTIGATIONS OF THE ALBATROSS. 259 7:30 a. m. on the 25th a vsoundiug Avas made in 1, 471 fathoms, green ooze.Serial temperatures and specific gravities were taken, and a success-ful haul of the trawl followed, the surface net being towed during theinterval of dredging. Submarine tow net.—Experiments with a new design of submarinetow net were made later in the day, with unsatisfactory results. Infact, it was a failure, owing, doubtless, to the large size of the net andits small mesTi, which caused undue tension on the bridles while towing. The frame is composed of rods and tubing of brass. There is a finescrew-thread on the upper half of the central shaft, which works in anut in the upper middle part of the frame. The lower end of the shaftis plain and passes through two studs in the frame, which serve asstops for the bridles. A propeller on the middle of the shaft holds itdoAvn while the apparatus is b

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• bookcentury1800
• bookdecade1890
• bookpublis
• booksubjectfisheries