. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. BIGELOW: EXPLORATIONS IX THE GULF OF MAINE. 37 the observations (p. 40). The thermometers were used in reversing cases of the Tanner tj^pe (Tanner, 1897, pi. 21) actuated by a propeller; and these worked very well. Two water-bottles were taken for collecting samples, a "Sigsbee" (Tanner, 1897, pi. 24): and a stop-cock bottle; but as the first trial of the "Sigsbee" showed that it could not be relied upon, all subsequent samples were obtained with the stop-cock bottle. This apparatus is a modificati
. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. BIGELOW: EXPLORATIONS IX THE GULF OF MAINE. 37 the observations (p. 40). The thermometers were used in reversing cases of the Tanner tj^pe (Tanner, 1897, pi. 21) actuated by a propeller; and these worked very well. Two water-bottles were taken for collecting samples, a "Sigsbee" (Tanner, 1897, pi. 24): and a stop-cock bottle; but as the first trial of the "Sigsbee" showed that it could not be relied upon, all subsequent samples were obtained with the stop-cock bottle. This apparatus is a modification of the stop-cock bottle used on the ]\Iicil\el Sars and highly recommended by Hel- land-Hansen and Xansen, (1909) the chief difference being that it is single instead of double, and actu- ated bv a messenger instead of bv a propeller. In its essentials (fig. 1) it consists of a brass tube, tinned on the inside, with a stop-cock at either end, the openings of the latter being only slightly smaller than the inside diameter of the tube. The mouth of the lower one carries a large copper funnel, which hastens the flow through the tube as it is being lowered and prevents water being carried downward in the bot- tle. Each st<5p-cock is hinged by a rod to the brass plate which carries the tripping gear, in such a way that when the bottle is raised both stop-cocks are open. When the bottle is tripped, the tube falls of its own weight, the hinge-rods turn- ing the cocks in their barrels, and closing them. The tripping gear consists of a scear which engages the end of the upper hinge-rod when the tube is raised, and of a trigger which trips the scear when pushed downward against its spring by the messenger which is sent down along the wire rope. The dog, or ratchet engages the lower hinge-rod when the bottle falls and is closed, to prevent accidental opening. Tliere^is^a. Fig. 1.— Stop-cock water Please note that these images are extracted from scanned page images that ma
Size: 1030px × 2426px
Photo credit: © Book Worm / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1910, booksubjectzoology, bookyear1913
