Discovery reports (1929) Discovery reports discoveryreports131936inst Year: 1929 CURRENT AND DRIFT OF THE SHIP 129 leeward of her outward course which was maintained at 224°. During her run from 25 to 100 miles from the coast the force of the wind and drift eased but thereafter in- creased again, rising to force 5 and increasing also the amount of her drift on the end of the line. On her return run on a course of 44° from Sts. WS 653 to 657, the force of the wind lessened gradually from 5 to 4-5, and with it the drift from 12 miles a day to zero. When the wind decreased further to force 4, t
Discovery reports (1929) Discovery reports discoveryreports131936inst Year: 1929 CURRENT AND DRIFT OF THE SHIP 129 leeward of her outward course which was maintained at 224°. During her run from 25 to 100 miles from the coast the force of the wind and drift eased but thereafter in- creased again, rising to force 5 and increasing also the amount of her drift on the end of the line. On her return run on a course of 44° from Sts. WS 653 to 657, the force of the wind lessened gradually from 5 to 4-5, and with it the drift from 12 miles a day to zero. When the wind decreased further to force 4, the ship drifted against it. It appears therefore that during the 58 hours from Sts. WS 647 to 657, while the ship's course was maintained at 224° on the outward and 44° on the inward run, the total drift including leeway amounts to no more than 8 miles a day. In similar wind conditions off Pichidanque Bay where there was no ob- servable current, the recorded amount of drift was more than twice as great. It seems necessary therefore off San Juan to postulate an offshore current flowing south-east against the wind. Current was shown to be absent within 24 miles of the Callao coast by observa- tions of discoloured water at the Palominos Island control stations and by the well-fixed Fig. 9. Antofagasta. Track of 'William positions of Sts. WS 663-666 (Fig. 10). At Scoresby', June 7-10. St. WS 630 was worked r , ,. r , , , , between the two positions shown. Course set farther distances from the shore a leeward „ r c ixfc /; j o c c 270 from St. WS 622 and 090 from bt. drift of 20 miles in the space of 28 hours (the wg 629. period between Sts. WS 666 and 671) accords with the drift experienced on other occasions. Observations of discoloured water off Palominos Island were first made on June 26, when a patch cinnamon rufous in colour lay south of San Lorenzo Island, its northern margin coming to an abrupt end opposite Palominos Island (Plate XVI, figs. 7 and 8). The bounda
Size: 1057px × 1892px
Photo credit: © Bookend / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: archive, book, drawing, historical, history, illustration, image, page, picture, print, reference, vintage
