Report on the scientific results of the voyage of H.M.SChallenger during the years 1873-76 : under the command of Captain George SNares, R.N., F.R.Sand Captain Frank Turle Thomson, R.N. . north-seeking end of the needle with a force considerably in excess of that due to the positionof Bermuda on the earth considered as a mas-net. O Magnetic disturbance was also found at three other stations in the eastern partsof this group of islands, but the observations made were too few in number to determineany distinct source for it. It is satisfactory, however, to be able to point out to vesselsvisiting

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Report on the scientific results of the voyage of H.M.SChallenger during the years 1873-76 : under the command of Captain George SNares, R.N., F.R.Sand Captain Frank Turle Thomson, R.N. . north-seeking end of the needle with a force considerably in excess of that due to the positionof Bermuda on the earth considered as a mas-net. O Magnetic disturbance was also found at three other stations in the eastern partsof this group of islands, but the observations made were too few in number to determineany distinct source for it. It is satisfactory, however, to be able to point out to vesselsvisiting the usual anchorage in Grassy Bay that there is little or no disturbance, whilstat two positions half a mile on either side of it there may be as much as 2° difference inthe observed magnetic bearing of an object the true bearing of which is common to The Voyage of H M.S Challenger Magnelical Results, Plate 1. N?- I Bermuda Islands Western Portion. UprllTiafion I The Figures m this plan are observed, differ ermes from, the iiormaL. The. dotted luxe shows assumed, position, of mjcu/rieizc focus. The blajclc curves dervote equal vcduu&s of aUsturba/Lce in the. DecHn-a.tion.... N?- 2. Inclmat-iou J The Figures iru thje. plcut, are observed differences fronv the normat.Vextical Force. ( The dotted. Tirue shows assicmed posxiioTV of rnxxgixitkLc. fociLS The hlajJc curves denote equal values vf disturbance in the IrLclinatLon.