We are, with the greatest deference,
Your Lordship's,
And the Royal Society's,
Most faithful and
most obedient Servants,
William Mountaine.
James Dodson.
A TABLE, exhibiting the different Variations of the Magnetic-Needle in the more frequented Oceans, from the Year 1700 to the Year 1756.
| Latitude. | Longitude, From London. | VARIATION. | |||||
|---|---|---|---|---|---|---|---|
| Anno 1700. | Anno 1710. | Anno 1720. | Anno 1730. | Anno 1744. | Anno 1756. | ||
| Degrees. | Degrees. | Degrees. | Degrees. | Degrees. | Degrees. | Degrees. | Degrees. |
| 0 | 0 | 4½ W | 10¼ W | 14¼ W | 15¼ W | ||
| 0 | 5 W | 2¾ W | 8¾ W | 12 W | 13¼ W | ||
| 0 | 10 W | 1½ W | 3½ W | 5½ W | 7 W | 10 W | 11 W |
| 0 | 15 W | 0½ W | 2 W | 3½ W | 5 W | 7½ W | 9 W |
| 0 | 20 W | 0¾ E | 0½ W | 1¾ W | 3 W | 5¼ W | 6½ W |
| 0 | 25 W | 1½ E | 0½ E | 0½ W | 1½ W | 3 W | 4 W |
| 0 | 30 W | 2½ E | 2 E | 1½ E | 1 E | 0¾ W | 0½ W |
| 0 | 35 W | 3¼ E | 3 E | 2¾ E | 2½ E | 1½ E | 1½ E |
| 0 | 40 W | 4¼ E | 4¼ E | 4 E | 3¾ E | 3½ E | 3½ E |
| 0 | 45 W | 5½ E | 5½ E | 5¼ E | 5 E | 4¾ E | 5 E |
| 0 | 50 W | 6¾ E | 5¾ E | 6 E | 6½ E | ||
| 0 | 5 E | 6 W | 12½ W | 15¾ W | 16½ W | ||
| 0 | 10 E | 7¾ W | 14¼ W | 17 W | 17½ W | ||
| 0 | 40 E | 16¾ W | 17 W | 17¼ W | 17 W | 16½ W | 16¾ W |
| 0 | 45 E | 17¾ W | 17¼ W | 16¾ W | 16¼ W | 15¾ W | 14½ W |
| 0 | 50 E | 17½ W | 16¾ W | 16 W | 15 W | 14 W | 11¾ W |
| 0 | 55 E | 16½ W | 15¼ W | 14 W | 13 W | 11½ W | 8¾ W |
| 0 | 60 E | 15¼ W | 13¾ W | 12½ W | 11 W | 9 W | 6 W |
| 0 | 65 E | 13½ W | 11¾ W | 10 W | 8¼ W | 6½ W | 4½ W |
| 0 | 70 E | 11½ W | 9¾ W | 7¾ W | 6 W | 4 W | 2¾ W |
| 0 | 75 E | 9¾ W | 7¾ W | 5¾ W | 4 W | 1¾ W | 1 W |
| 0 | 80 E | 7¾ W | 6 W | 4¼ W | 3 W | 0¼ W | 0¼ E |
| 0 | 85 E | 5½ W | 4 W | 2½ W | 1½ W | 0¼ E | 1¼ E |
| 0 | 90 E | 4¼ W | 3½ W | 1½ W | 0½ W | 1¼ W | 1 E |
| 0 | 95 E | 3¼ W | 2¼ W | 2 W | 0½ W | ||
| 0 | 100 E | 2½ W | 1 W | 2½ W | 1 W | ||
| 5 N | 0 | 4¾ W | 10½ W | 15 W | 15¼ W | ||
| 5 N | 5 W | 3¼ W | 9 W | 13 W | 13 W | ||
| 5 N | 10 W | 1¾ W | 7½ W | 10¾ W | 11¼ W | ||
| 5 N | 15 W | 0¾ W | 2¼ W | 3¾ W | 5½ W | 8½ W | 9¼ W |
| 5 N | 20 W | 0 | 1½ W | 2½ W | 3½ W | 6 W | 7¼ W |
| 5 N | 25 W | 1 E | 0 | 1 W | 2 W | 3¾ W | 4½ W |
| 5 N | 30 W | 1¾ E | 1¼ E | 0½ E | 0¼ W | 1½ W | 1½ W |
| 5 N | 35 W | 2½ E | 2¼ E | 1¾ E | 1½ E | 0½ E | 0½ E |
| 5 N | 40 W | 3½ E | 3¼ E | 3 E | 2½ E | 2¼ E | 2¼ E |
| 5 N | 45 W | 4½ E | 4¼ E | 4¼ E | 4 E | 3¾ E | 4 E |
| 5 N | 50 W | 5½ E | 5½ E | 5¼ E | 5¼ E | 5 E | 5¼ E |
| 5 N | 55 W | 6¾ E | 6¼ E | 6½ E | |||
| 5 N | 5 E | 6¼ W | 12¾ W | 16¼ W | 16½ W | ||
| 5 N | 10 E | 7¾ W | 14¼ W | 17½ W | 17½ W | ||
| 5 N | 45 E | 16¾ W | 16 W | 15¼ W | 14¾ W | 14 W | 13¾ W |
| 5 N | 50 E | 16¾ W | 15¾ W | 14¾ W | 13½ W | 12¼ W | 11 W |
| 5 N | 55 E | 15½ W | 14¼ W | 13 W | 12 W | 10 W | 8¼ W |
| 5 N | 60 E | 14¼ W | 12¾ W | 11¼ W | 10 W | 8¼ W | 6 W |
| 5 N | 65 E | 12¾ W | 11 W | 9½ W | 8 W | 6 W | 4½ W |
| 5 N | 70 E | 10¾ W | 9 W | 7¼ W | 5½ W | 3¾ W | 2¾ W |
| 5 N | 75 E | 8¾ W | 7 W | 5¼ W | 3¾ W | 1¾ W | 0¾ W |
| 5 N | 80 E | 6½ W | 5 W | 3½ W | 2½ W | 0¼ W | 0¼ E |
| 5 N | 85 E | 4¾ W | 3¾ W | 2¾ W | 1½ W | 0¼ W | 1¼ E |
| 5 N | 90 E | 3¾ W | 1¼ W | 0½ E | |||
| 5 N | 95 E | 2¾ W | 2¼ W | 0½ W | |||
| Latitude. | Longitude, From London. | VARIATION. | |||||
|---|---|---|---|---|---|---|---|
| Anno 1700. | Anno 1710. | Anno 1720. | Anno 1730. | Anno 1744. | Anno 1756. | ||
| Degrees. | Degrees. | Degrees. | Degrees. | Degrees. | Degrees. | Degrees. | Degrees. |
| 10 N | 15 W | 1¼ W | 4½ W | 6 W | 9¼ W | 10 W | |
| 10 N | 20 W | 0½ W | 2 W | 3¼ W | 4½ W | 7 W | 8 W |
| 10 N | 25 W | 0¼ E | 0¾ W | 1¾ W | 2¾ W | 4½ W | 5½ W |
| 10 N | 30 W | 1 E | 0½ E | 0 | 1 W | 2¼ W | 3 W |
| 10 N | 35 W | 1¾ E | 1¼ E | 0¾ E | 0¼ E | 0½ W | 1 W |
| 10 N | 40 W | 2½ E | 2¼ E | 2 E | 1¾ E | 1¼ E | 1 E |
| 10 N | 45 W | 3½ E | 3½ E | 3¼ E | 3 E | 2¾ E | 2½ E |
| 10 N | 50 W | 4½ E | 4½ E | 4¼ E | 4¼ E | 4 E | 4 E |
| 10 N | 55 W | 5½ E | 5½ E | 5½ E | 5¼ E | 5¼ E | 5½ E |
| 10 N | 60 W | 6½ E | 6½ E | 6¾ E | |||
| 10 N | 50 E | 16 W | 15 W | 14 W | 12¾ W | 11¼ W | 10½ W |
| 10 N | 55 E | 15 W | 13½ W | 12 W | 11 W | 9¼ W | 8 W |
| 10 N | 60 E | 13½ W | 12 W | 10½ W | 9¼ W | 7¾ W | 6 W |
| 10 N | 65 E | 12 W | 10¾ W | 9 W | 7½ W | 6 W | 4½ W |
| 10 N | 70 E | 10 W | 8¾ W | 6½ W | 5 W | 3¾ W | 3 W |
| 10 N | 75 E | 8 W | 6½ W | 5 W | 3½ W | 1¾ W | 1 E |
| 10 N | 80 E | 5¾ W | 4½ W | 3¼ W | 2 W | 0½ W | 0¼ E |
| 10 N | 85 E | 4½ W | 3½ W | 2¼ W | 1¼ W | 0 | 1 E |
| 10 N | 90 E | 3½ W | 1½ W | 0½ E | |||
| 10 N | 95 E | 2½ W | 2¼ W | 0½ W | |||
| 15 N | 20 W | 1 W | 2½ W | 4 W | 5½ W | 7 W | 9 W |
| 15 N | 25 W | 0½ W | 1½ W | 2½ W | 3½ W | 4¾ W | 6½ W |
| 15 N | 30 W | 0¼ E | 0¼ W | 1 W | 1¾ W | 2¾ W | 4½ W |
| 15 N | 35 W | 1 E | 0½ E | 0 | 0½ W | 1¼ W | 2½ W |
| 15 N | 40 W | 1½ E | 1¾ E | 1 E | 0½ E | 0 | 0½ W |
| 15 N | 45 W | 2¼ E | 2¼ E | 2 E | 1¾ E | 1½ E | 1 E |
| 15 N | 50 W | 3¼ E | 3¼ E | 3¼ E | 3 E | 2¾ E | 2½ E |
| 15 N | 55 W | 4 E | 4 E | 4 E | 4 E | 4 E | 3¾ E |
| 15 N | 60 W | 5 E | 5 E | 5 E | 5 E | 5 E | 5 E |
| 15 N | 65 W | 6 E | 5 E | 6 E | 6 E | ||
| 15 N | 70 W | 7 E | 5½ E | 6¾ E | 7 E | ||
| 15 N | 75 W | 7¾ E | 7 E | 7¾ E | |||
| 15 N | 80 W | 8¼ E | 7 E | 8 E | |||
| 15 N | 50 E | 15½ W | 14¼ W | 13 W | 11¾ W | 10½ W | 9¾ W |
| 15 N | 55 E | 14¼ W | 12¾ W | 11½ W | 10¾ W | 8¾ W | 7¾ W |
| 15 N | 60 E | 13 W | 11¾ W | 10¼ W | 9 W | 7½ W | 6 W |
| 15 N | 65 E | 11½ W | 10 W | 8¾ W | 7½ W | 6 W | 4½ W |
| 15 N | 70 E | 9¾ W | 8¼ W | 6¾ W | 5½ W | 4 W | 2¾ W |
| 15 N | 75 E | 8 W | 6½ W | 5 W | 3½ W | 2¼ W | 0¾ W |
| 15 N | 80 E | 5¾ W | 4½ W | 3½ W | 2½ W | 1¼ W | 0 |
| 15 N | 85 E | 4¼ W | 3¼ W | 2¼ W | 1 W | 0¼ W | 0¾ W |
| 15 N | 90 E | 3¼ W | 2½ W | 1¼ W | 0¾ W | 0½ W | |
| 15 N | 95 E | 2½ W | 1½ W | 2¼ W | 0½ W | ||
| 20 N | 20 W | 1½ W | 3 W | 4¼ W | 5¼ W | 7 W | 10 W |
| 20 N | 25 W | 1 W | 2 W | 2¾ W | 3½ W | 4¾ W | 8 W |
| 20 N | 30 W | 0½ W | 1 W | 1½ W | 2¼ W | 3¼ W | 5¾ W |
| 20 N | 35 W | 0¼ E | 0¼ W | 0¾ W | 1½ W | 2¼ W | 4 W |
| 20 N | 40 W | 0¾ E | ¼ E | 0 | 0½ W | 1 W | 2½ W |
| 20 N | 45 W | 1½ E | 1¼ E | 1 E | ¾ E | 0¼ E | 0¾ W |
| 20 N | 50 W | 2 E | 2 E | 1¾ E | 1½ E | 1¼ E | 0¾ E |
| 20 N | 55 W | 2¾ E | 2¾ E | 2¾ E | 2½ E | 2½ E | 2 E |
| 20 N | 60 W | 3¾ E | 3¾ E | 3¾ E | 3½ E | 3½ E | 3¼ E |
| 20 N | 65 W | 4¾ E | 4¼ E | 4 E | |||
| 20 N | 70 W | 5½ E | 5 E | 5 E | |||
| 20 N | 75 W | 6¼ E | 5¼ E | 5¼ E | |||
| 20 N | 80 W | 7 E | 5¼ E | 6 E | |||
| 20 N | 60 E | 12¾ W | 11¼ W | 10 W | 9 W | 7½ W | 6 W |
| 20 N | 65 E | 11½ W | 10 W | 8½ W | 7¼ W | 6 W | 4½ W |
| 20 N | 70 E | 9¾ W | 8½ W | 7 W | 5¾ W | 4½ W | 2¾ W |
| 20 N | 90 E | 3½ W | 2½ W | 1½ W | 1 W | 0½ W | 1 E |
| 25 N | 20 W | 2 W | 3¼ W | 4 W | 5¼ W | 7 W | 11 W |
| 25 N | 25 W | 1¾ W | 2¼ W | 2¾ W | 4 W | 5¼ W | 9½ W |
| 25 N | 30 W | 1¼ W | 1¾ W | 2¼ W | 3 W | 4 W | 7½ W |
| 25 N | 35 W | 1 W | 1½ W | 2 W | 2½ W | 3 W | 5½ W |
| 25 N | 40 W | 0½ W | 0¾ W | 1 W | 1½ W | 2¼ W | 3¾ W |
| 25 N | 45 W | 0¼ E | 0 | 0½ W | 1 W | 1½ W | 2½ W |
| 25 N | 50 W | 0¾ E | 0½ E | 0¼ E | 0 | 0½ W | 1 W |
| 25 N | 55 W | 1¼ E | 1 E | 1 E | ¾ E | 0½ E | 0 |
| 25 N | 60 W | 2 E | 2 E | 2 E | 1½ E | 1½ E | 1¼ E |
| 25 N | 65 W | 2¾ E | 2¼ E | 2¼ E | |||
| 25 N | 70 W | 3½ E | 3¼ E | 2¾ E | |||
| 25 N | 75 W | 4¼ E | 3½ E | 3 E | |||
| 25 N | 80 W | 4¾ E | 3½ E | 3 E | |||
| 25 N | 60 E | 12¾ W | 11½ W | 10¼ W | 9 W | 7½ W | 6 W |
| 25 N | 65 E | 11½ W | 10¼ W | 9 W | 7½ W | 6 W | 4½ W |
| 25 N | 70 E | 10 W | 8¾ W | 7½ W | 6 W | 4½ W | 2¾ W |
| 30 N | 10 W | 3½ W | 11½ W | 13¾ W | |||
| 30 N | 15 W | 3¼ W | 10¼ W | 12¾ W | |||
| 30 N | 20 W | 3 W | 4¼ W | 5½ W | 6¾ W | 8½ W | 12 W |
| 30 N | 25 W | 2¾ W | 3½ W | 4¼ W | 5½ W | 6¾ W | 10¾ W |
| 30 N | 30 W | 2½ W | 3 W | 3½ W | 4¼ W | 5¼ W | 9 W |
| 30 N | 35 W | 2¼ W | 2¾ W | 3¼ W | 3¾ W | 4¼ W | 7 W |
| 30 N | 40 W | 1¾ W | 2 W | 2½ W | 3 W | 3½ W | 5¼ W |
| 30 N | 45 W | 1¼ W | 1½ W | 2 W | 2¼ W | 2¾ W | 4 W |
| 30 N | 50 W | 0¾ W | 1 W | 1½ W | 1¾ W | 2¼ W | 3 W |
| 30 N | 55 W | 0¼ W | ½ W | 1 W | 1¼ W | 1½ W | 2¼ W |
| 30 N | 60 W | 0¼ E | 0 | ¼ W | 0½ W | 1 W | 1½ W |
| 30 N | 65 W | 0¾ E | ½ E | ¼ E | 0 | ¼ W | 1 W |
| 30 N | 70 W | 1½ E | 1¼ E | 1 E | ¾ E | ¼ E | ½ W |
| 30 N | 75 W | 2 E | 1½ E | 1¼ E | 1 E | ½ E | 0 |
| 30 N | 80 W | 2¼ E | ¾ E | 0 | |||
| 35 N | 10 W | 4¼ W | 9¾ W | 12¼ W | 14¾ W | ||
| 35 N | 15 W | 4 W | 9¼ W | 11½ W | 13¾ W | ||
| 35 N | 20 W | 4 W | 8¼ W | 10¼ W | 13 W | ||
| 35 N | 25 W | 3¾ W | 4¾ W | 6 W | 7½ W | 9 W | 12¼ W |
| 35 N | 30 W | 3¾ W | 4½ W | 5½ W | 6¾ W | 8 W | 10½ W |
| 35 N | 35 W | 3¾ W | 4¼ W | 5¼ W | 6 W | 7 W | 8¾ W |
| 35 N | 40 W | 3¾ W | 4 W | 4½ W | 5¼ W | 6¼ W | 7¼ W |
| 35 N | 45 W | 3½ W | 3¾ W | 4¼ W | 4¾ W | 5½ W | 6¼ W |
| 35 N | 50 W | 3½ W | 3¾ W | 4 W | 4¼ W | 5 W | 5½ W |
| 35 N | 55 W | 3½ W | 3¾ W | 4 W | 4¼ W | 4¾ W | 5 W |
| 35 N | 60 W | 3¼ W | 3¾ W | 4 W | 4¼ W | 5 W | 5¼ W |
| 35 N | 65 W | 3 W | 5¼ W | 6 W | |||
| 35 N | 70 W | 2½ W | 5¾ W | 6¾ W | |||
| 35 N | 75 W | 2¼ W | 6½ W | 7 W | |||
| 40 N | 10 W | 5 W | 10¾ W | 13¼ W | 15 W | ||
| 40 N | 15 W | 5¼ W | 10½ W | 12¾ W | 14½ W | ||
| 40 N | 20 W | 5¼ W | 10 W | 12¼ W | 14¼ W | ||
| 40 N | 25 W | 5½ W | 9½ W | 11¼ W | 13½ W | ||
| 40 N | 30 W | 5½ W | 6¾ W | 8 W | 9 W | 10¼ W | 12¾ W |
| 40 N | 35 W | 5¾ W | 6½ W | 7¼ W | 8¼ W | 9½ W | 11¼ W |
| 40 N | 40 W | 5¾ W | 6¼ W | 7¼ W | 8 W | 9 W | 10 W |
| 40 N | 45 W | 6 W | 7½ W | 8½ W | 9½ W | ||
| 40 N | 50 W | 6¼ W | 7¼ W | 8½ W | 9½ W | ||
| 40 N | 55 W | 6½ W | 7¾ W | 8¾ W | 10 W | ||
| 40 N | 60 W | 6¾ W | 8 W | 9¼ W | 11 W | ||
| 40 N | 65 W | 7 W | 8½ W | 10¼ W | 12 W | ||
| 40 N | 70 W | 7 W | 9 W | 11½ W | 12¾ W | ||
| Latitude. | Longitude, From London. | VARIATION. | |||||
|---|---|---|---|---|---|---|---|
| Anno 1700. | Anno 1710. | Anno 1720. | Anno 1730. | Anno 1744. | Anno 1756. | ||
| Degrees. | Degrees. | Degrees. | Degrees. | Degrees. | Degrees. | Degrees. | Degrees. |
| 45 N | 5 W | 6 W | 12½ W | 15½ W | 16½ W | ||
| 45 N | 10 W | 6½ W | 12¼ W | 15 W | 16½ W | ||
| 45 N | 15 W | 6¾ W | 11¾ W | 14¾ W | 16¼ W | ||
| 45 N | 20 W | 7 W | 11½ W | 14½ W | 16 W | ||
| 45 N | 25 W | 7½ W | 11½ W | 14 W | 16 W | ||
| 45 N | 30 W | 8 W | 11¾ W | 13¾ W | 15¾ W | ||
| 45 N | 35 W | 8¾ W | 11¾ W | 13¼ W | 15¼ W | ||
| 45 N | 40 W | 9½ W | 12 W | 13 W | 15 W | ||
| 45 N | 45 W | 10½ W | 12¾ W | 13¼ W | 15½ W | ||
| 45 N | 50 W | 11½ W | 13½ W | 14 W | 16 W | ||
| 45 N | 55 W | 12½ W | 14 W | 15¼ W | 17 W | ||
| 45 N | 60 W | 13¾ W | 14 W | 16 W | 18½ W | ||
| 50 N | 5 W | 7½ W | 17 W | 19¼ W | |||
| 50 N | 10 W | 7¾ W | 17¼ W | 19½ W | |||
| 50 N | 15 W | 8½ W | 17½ W | 20 W | |||
| 50 N | 20 W | 9 W | 17½ W | 20½ W | |||
| 50 N | 25 W | 9¾ W | 17¾ W | 21 W | |||
| 5 S | 0 | 4¼ W | 10 W | 13¼ W | 15 W | ||
| 5 S | 5 W | 2½ W | 8½ W | 11¼ W | 13 W | ||
| 5 S | 10 W | 1 W | 3 W | 4¾ W | 6½ W | 9¼ | 10¾ W |
| 5 S | 15 W | 0 | 1½ W | 3 W | 4½ W | 6¾ W | 8½ W |
| 5 S | 20 W | 1¼ E | 0¼ W | 0¾ W | 2¼ W | 4 W | 6 W |
| 5 S | 25 W | 2¼ E | 1¼ E | 0¼ E | 0¾ W | 2 W | 3 W |
| 5 S | 30 W | 3¼ E | 2¼ E | 1¾ E | 1 E | 0¼ E | 0 |
| 5 S | 35 W | 4¼ E | 4 E | 3½ E | 3¼ E | 2¾ E | 2¾ E |
| 5 S | 5 E | 6 W | 12½ W | 15 W | 16 W | ||
| 5 S | 10 E | 7½ W | 14¼ W | 16½ W | 17 W | ||
| 5 S | 40 E | 18 W | 17¾ W | 17¾ W | 17½ W | 17½ W | 18 W |
| 5 S | 45 E | 18½ W | 18¼ W | 18 W | 17½ W | 17 W | 16 W |
| 5 S | 50 E | 18½ W | 17¾ W | 17 W | 16¼ W | 15½ W | 12¾ W |
| 5 S | 55 E | 17½ W | 16½ W | 15½ W | 14¾ W | 13 W | 9¼ W |
| 5 S | 60 E | 16¼ W | 14¾ W | 13¼ W | 12 W | 10 W | 6½ W |
| 5 S | 65 E | 14¾ W | 12¾ W | 10¾ W | 9 W | 7 W | 4½ W |
| 5 S | 70 E | 13 W | 11 W | 9 W | 6¾ W | 4½ W | 3 W |
| 5 S | 75 E | 11 W | 9 W | 7 W | 5 W | 2¼ W | 1 W |
| 5 S | 80 E | 9 W | 7 W | 5 W | 3 W | 0¾ W | 0 |
| 5 S | 85 E | 7 W | 5½ W | 3¾ W | 2½ W | 0½ W | 0¾ E |
| 5 S | 90 E | 5 W | 4½ W | 2¾ W | 2 W | 1¼ W | 0¾ E |
| 5 S | 95 E | 3¾ W | 3½ W | 1½ W | 1½ W | 2 W | 0½ W |
| 5 S | 100 E | 3 W | 2½ W | 1½ W | 1 W | 2¾ W | 1½ W |
| 10 S | 0 | 3¾ W | 9½ W | 12½ W | 14¼ W | ||
| 10 S | 5 W | 2¼ W | 4¼ W | 6¼ W | 8¼ W | 10½ W | 12¾ W |
| 10 S | 10 W | 0¾ W | 2¾ W | 4¾ W | 6½ W | 8¼ W | 10¼ W |
| 10 S | 15 W | ½ E | 1 W | 2½ W | 4 W | 5¾ W | 7¾ W |
| 10 S | 20 W | 1¾ E | 0½ E | 0 | 1½ W | 3 W | 4¾ W |
| 10 S | 25 W | 3 E | 2½ E | 1¾ E | 0¾ E | 0¾ W | 2 W |
| 10 S | 30 W | 4 E | 3½ E | 3 E | 2½ E | 1¾ E | 1 E |
| 10 S | 35 W | 5¼ E | 5 E | 4¾ E | 4½ W | 4 E | 3½ E |
| 10 S | 5 E | 5¾ W | 12 W | 14½ W | 15¾ W | ||
| 10 S | 10 E | 7½ W | 14 W | 16 W | 16¾ W | ||
| 10 S | 15 E | 9¼ W | 15½ W | 17¼ W | 17¾ W | ||
| 10 S | 40 E | 18¾ W | 18¾ W | 18¾ W | 18¾ W | 19 W | 19¼ W |
| 10 S | 45 E | 19½ W | 19¼ W | 19 W | 18¾ W | 18½ W | 18 W |
| 10 S | 50 E | 19½ W | 19 W | 18½ W | 17¾ W | 16¾ W | 14¼ W |
| 10 S | 55 E | 18½ W | 17½ W | 16½ W | 15½ W | 14½ W | 10½ W |
| 10 S | 60 E | 17 W | 16 W | 15 W | 14 W | 11¼ W | 7¼ W |
| 10 S | 65 E | 15¾ W | 13¾ W | 11¾ W | 10 W | 8 W | 5 W |
| 10 S | 70 E | 14½ W | 12 W | 10 W | 8 W | 5½ W | 3½ W |
| 10 S | 75 E | 12½ W | 10¼ W | 9 W | 5¾ W | 3½ W | 2 W |
| 10 S | 80 E | 10½ W | 8 W | 5½ W | 4 W | 1¾ W | 1 W |
| 10 S | 85 E | 8½ W | 6¾ W | 5 W | 3¾ W | 1½ W | 0¼ W |
| 10 S | 90 E | 6¾ W | 5½ W | 4¼ W | 3 W | 1¾ W | 0¼ W |
| 10 S | 95 E | 5 W | 4½ W | 4 W | 3¼ W | 2½ W | 1 W |
| 10 S | 100 E | 3¾ W | 3½ W | 3¼ W | 3 W | 2¾ W | 2 W |
| 10 S | 105 E | 2¾ W | 2¾ W | 2½ W | 2½ W | 3¼ W | 2¾ W |
| 10 S | 110 E | 2 W | 3¾ W | 3¼ W | |||
| 15 S | 0 | 3½ W | 5½ W | 7½ W | 9½ W | 11¾ W | 14 W |
| 15 S | 5 W | 1¾ W | 3¾ W | 5¾ W | 7¾ W | 9½ W | 12 W |
| 15 S | 10 W | ¼ W | 2 W | 3¾ W | 5½ W | 7½ W | 9½ W |
| 15 S | 15 W | 1¼ E | 0¼ W | 1¾ W | 3¼ W | 4¾ W | 7 W |
| 15 S | 20 W | 2½ E | 1½ E | 0¾ E | 0½ W | 1¾ W | 4 W |
| 15 S | 25 W | 3¾ E | 3 E | 2¼ E | 1½ E | 0½ E | 1 W |
| 15 S | 30 W | 5 E | 4½ E | 4 E | 3½ E | 3 E | 2 E |
| 15 S | 35 W | 6½ E | 6¼ E | 5¾ E | 5½ E | 5 E | 4½ E |
| 15 S | 40 W | 7¾ E | 6¾ E | 6½ E | |||
| 15 S | 5 E | 5½ W | 11½ W | 13¾ W | 15¼ W | ||
| 15 S | 10 E | 7½ W | 14 W | 15½ W | 16½ W | ||
| 15 S | 40 E | 19¾ W | 19¾ W | 20 W | 20 W | 20 W | 20 W |
| 15 S | 45 E | 20½ W | 20½ W | 20¼ W | 20¼ W | 20 W | 19½ W |
| 15 S | 50 E | 20½ W | 20 W | 19½ W | 18¾ W | 18 W | 16¼ W |
| 15 S | 55 E | 19½ W | 18½ W | 17½ W | 16½ W | 15½ W | 12½ W |
| 15 S | 60 E | 18¼ W | 17 W | 16 W | 14½ W | 12½ W | 9 W |
| 15 S | 65 E | 17 W | 15½ W | 13½ W | 12 W | 9¾ W | 6 W |
| 15 S | 70 E | 15½ W | 12¾ W | 10¾ W | 9 W | 7¼ W | 4¼ W |
| 15 S | 75 E | 14 W | 12 W | 9¾ W | 7½ W | 5 W | 3¼ W |
| 15 S | 80 E | 12 W | 10 W | 8 W | 6 W | 3½ W | 2½ W |
| 15 S | 85 E | 10 W | 8 W | 6¼ W | 4¾ W | 2¾ W | 2¼ W |
| 15 S | 90 E | 8½ W | 7¼ W | 6 W | 4½ W | 3 W | 2¼ W |
| 15 S | 95 E | 6½ W | 5¾ W | 5 W | 4¼ W | 3¼ W | 2¾ W |
| 15 S | 100 E | 5 W | 4¾ W | 4½ W | 4¼ W | 3¾ W | 3½ W |
| 15 S | 105 E | 3½ W | 3½ W | 3¾ W | 3¾ W | 4¼ W | 3¾ W |
| 15 S | 110 E | 2½ W | 4½ W | ||||
| 20 S | 0 | 3¼ W | 5¼ W | 7¼ W | 9 W | 11 W | 13½ W |
| 20 S | 5 W | 1½ W | 3¼ W | 5 W | 6¾ W | 8¾ W | 11¼ W |
| 20 S | 10 W | 0½ E | 1¼ W | 3 W | 4¾ W | 6½ W | 8¾ W |
| 20 S | 15 W | 1¾ E | 0½ E | 0¾ W | 2 W | 3½ W | 5¾ W |
| 20 S | 20 W | 3 E | 2¾ E | 1½ E | 0½ W | 0½ W | 3 W |
| 20 S | 25 W | 4¾ E | 4¼ E | 3½ E | 2¾ E | 2 E | 0 |
| 20 S | 30 W | 6 E | 5½ E | 5¼ E | 4¾ E | 4¼ E | 2½ E |
| 20 S | 35 W | 7¾ E | 7½ E | 7¼ E | 6¾ E | 6½ E | 5 E |
| 20 S | 40 W | 9¼ E | 8 E | 7½ E | |||
| 20 S | 5 E | 5½ W | 11 W | 13¼ W | 15 W | ||
| 20 S | 10 E | 7½ W | 13½ W | 15 W | 16¼ W | ||
| 20 S | 15 E | 9½ W | 15½ W | 16½ W | 17¾ W | ||
| 20 S | 35 E | 19 W | 19¼ W | 19¾ W | 20¼ W | 20¾ W | 22 W |
| 20 S | 40 E | 20½ W | 20¾ W | 21¼ W | 21½ W | 21¾ W | 22 W |
| 20 S | 45 E | 21¼ W | 21¼ W | 21½ W | 21½ W | 21¾ W | 21¼ W |
| 20 S | 50 E | 21¼ W | 21 W | 20¾ W | 20¼ W | 19¾ W | 18¾ W |
| 20 S | 55 E | 20½ W | 20 W | 19¼ W | 18½ W | 17 W | 15 W |
| 20 S | 60 E | 19½ W | 18¼ W | 17 W | 5¾ W | 14½ W | 11¼ W |
| 20 S | 65 E | 18¼ W | 17 W | 15¾ W | 14¼ W | 12 W | 8 W |
| 20 S | 70 E | 16¾ W | 15½ W | 13½ W | 12 W | 10 W | 6 W |
| 20 S | 75 E | 15 W | 13 W | 10½ W | 9 W | 7¾ W | 4¾ W |
| 20 S | 80 E | 13½ W | 11¾ W | 9¾ W | 8 W | 6 W | 4½ W |
| 20 S | 85 E | 11½ W | 10 W | 8½ W | 7 W | 5 W | 4¼ W |
| 20 S | 90 E | 10 W | 8¾ W | 7½ W | 6¼ W | 4¾ W | 4½ W |
| 20 S | 95 E | 8 W | 7¼ W | 6½ W | 5¾ W | 4¾ W | 4½ W |
| 20 S | 100 E | 6½ W | 6¼ W | 6 W | 5½ W | 5 W | 4¾ W |
| 20 S | 105 E | 4¾ W | 5 W | 5 W | 5 W | 5 W | 4¾ W |
| 25 S | 0 | 3 W | 5 W | 7 W | 8¾ W | 10½ W | 12½ W |
| 25 S | 5 W | 1 W | 2¾ W | 4½ W | 6¼ W | 8 W | 10 W |
| 25 S | 10 W | 1 E | 0½ W | 2¾ W | 4 W | 5½ W | 7½ W |
| 25 S | 15 W | 2½ E | 1¼ W | 0 | 1¼ W | 2½ W | 4½ W |
| 25 S | 20 W | 4 E | 3¼ E | 2 E | 1¼ E | 0½ E | 2¾ W |
| 25 S | 25 W | 6 E | 5¼ E | 4½ E | 3¾ E | 3 E | 1 E |
| 25 S | 30 W | 7½ E | 7 E | 6½ E | 6 E | 5½ E | 3½ E |
| 25 S | 35 W | 9¼ E | 7½ E | 6 E | |||
| 25 S | 40 W | 11 E | 9 E | ||||
| 25 S | 5 E | 5¼ W | 7 W | 8¾ W | 10½ W | 12½ W | 14½ W |
| 25 S | 10 E | 7½ W | 14½ W | 16 W | |||
| 25 S | 15 E | 9½ W | 16¼ W | 17¾ W | |||
| 25 S | 35 E | 19½ W | 20¼ W | 20¾ W | 21½ W | 22¼ W | 23½ W |
| 25 S | 40 E | 21 W | 21½ W | 22 W | 22½ W | 23¼ W | 23¾ W |
| 25 S | 45 E | 22¼ W | 22½ W | 22¾ W | 23 W | 23¼ W | 23 W |
| 25 S | 50 E | 22½ W | 22½ W | 22¼ W | 22¼ W | 22 W | 21 W |
| 25 S | 55 E | 22 W | 21½ W | 21 W | 20½ W | 19¾ W | 18 W |
| 25 S | 60 E | 20¾ W | 19¾ W | 19 W | 18¼ W | 17 W | 14¾ W |
| 25 S | 65 E | 19¼ W | 18¼ W | 17¼ W | 16¼ W | 15 W | 11¾ W |
| 25 S | 70 E | 17¾ W | 16¾ W | 15¾ W | 14½ W | 13 W | 9½ W |
| 25 S | 75 E | 16¼ W | 15 W | 13¾ W | 12½ W | 11¼ W | 8 W |
| 25 S | 80 E | 14¾ W | 13½ W | 12¼ W | 10¾ W | 9¼ W | 7½ W |
| 25 S | 85 E | 13 W | 11¾ W | 10½ W | 9¼ W | 8 W | 7¼ W |
| 25 S | 90 E | 11¼ W | 10¼ W | 9¾ W | 8¼ W | 7¼ W | 7 W |
| 25 S | 95 E | 9½ W | 9 W | 8½ W | 7¾ W | 7 W | 6½ W |
| 25 S | 100 E | 7¾ W | 7½ W | 7¼ W | 7 W | 6¾ W | 6 W |
| Latitude. | Longitude, From London. | VARIATION. | |||||
|---|---|---|---|---|---|---|---|
| Anno 1700. | Anno 1710. | Anno 1720. | Anno 1730. | Anno 1744. | Anno 1756. | ||
| Degrees. | Degrees. | Degrees. | Degrees. | Degrees. | Degrees. | Degrees. | Degrees. |
| 30 S | 0 | 2¾ W | 4¼ W | 6 W | 7¾ W | 9½ W | 11¾ W |
| 30 S | 5 W | 0½ W | 2 W | 3½ W | 5¼ W | 7 W | 9 W |
| 30 S | 10 W | 1½ E | 0 | 1½ W | 3 W | 4½ W | 6¼ W |
| 30 S | 15 W | 3¼ E | 2¼ E | 0¾ E | 0¼ W | 1½ W | 3½ W |
| 30 S | 20 W | 5 E | 4¾ E | 3¾ E | 2¾ E | 1½ E | 0½ W |
| 30 S | 25 W | 7¼ E | 6½ E | 5¾ E | 5 E | 4 E | 2 E |
| 30 S | 30 W | 9 E | 6½ E | 4½ E | |||
| 30 S | 35 W | 11 E | 8½ E | 7¼ E | |||
| 30 S | 5 E | 5 W | 7 W | 8¾ W | 10¼ W | 11¾ W | 13¾ W |
| 30 S | 10 E | 7¼ W | 9¼ W | 11¼ W | 12¾ W | 14 W | 15½ W |
| 30 S | 15 E | 9½ W | 16 W | 17½ W | |||
| 30 S | 30 E | 17½ W | 18½ W | 19½ W | 20½ W | 21¾ W | 23¼ W |
| 30 S | 35 E | 20¼ W | 21 W | 21¾ W | 22½ W | 23½ W | 24¾ W |
| 30 S | 40 E | 21¾ W | 22½ W | 23¼ W | 24 W | 24¾ W | 25¼ W |
| 30 S | 45 E | 23 W | 23½ W | 24 W | 24½ W | 25¼ W | 24½ W |
| 30 S | 50 E | 23½ W | 23¾ W | 24 W | 24¼ W | 24½ W | 23¼ W |
| 30 S | 55 E | 23 W | 23 W | 23 W | 22¾ W | 22½ W | 21 W |
| 30 S | 60 E | 21¾ W | 21½ W | 21 W | 20½ W | 20 W | 18 W |
| 30 S | 65 E | 20¼ W | 19½ W | 19 W | 18½ W | 17¾ W | 15 W |
| 30 S | 70 E | 18¾ W | 18 W | 17¼ W | 16½ W | 15½ W | 13 W |
| 30 S | 75 E | 17¼ W | 16½ W | 15¾ W | 14¾ W | 13¾ W | 11½ W |
| 30 S | 80 E | 15¾ W | 15 W | 14 W | 13 W | 12 W | 10¾ W |
| 30 S | 85 E | 14 W | 13¼ W | 12½ W | 11½ W | 10½ W | 10¼ W |
| 30 S | 90 E | 12½ W | 11¾ W | 11 W | 10¼ W | 9½ W | 9½ W |
| 30 S | 95 E | 10½ W | 10 W | 9½ W | 9¾ W | 8¾ W | 9 W |
| 30 S | 100 E | 8¾ W | 8¼ W | ||||
| 35 S | 0 | 2½ W | 4 W | 5½ W | 7 W | 8½ W | 10½ W |
| 35 S | 5 W | 0 | 1 W | 2½ W | 4 W | 5¾ W | 7¾ W |
| 35 S | 10 W | 2¼ E | 1½ E | 0½ W | 1¾ W | 3¼ W | 5 W |
| 35 S | 15 W | 4¼ E | 0¼ W | 2¼ W | |||
| 35 S | 20 W | 6¾ E | 2½ E | 0½ E | |||
| 35 S | 25 W | 8¾ E | 5 E | 3 E | |||
| 35 S | 30 W | 10¾ E | 7¼ E | 5¾ E | |||
| 35 S | 35 W | 12¾ E | 9¼ E | 8¼ E | |||
| 35 S | 5 E | 5 W | 6½ W | 8 W | 9½ W | 11 W | 13 W |
| 35 S | 10 E | 7¼ W | 8½ W | 10¼ W | 11¾ W | 13½ W | 15¼ W |
| 35 S | 15 E | 9¾ W | 11¼ W | 12¾ W | 14¼ W | 15½ W | 17½ W |
| 35 S | 20 E | 12½ W | 14 W | 15½ W | 17 W | 18½ W | 19¾ W |
| 35 S | 25 E | 15¼ W | 16½ W | 18 W | 19¼ W | 20¾ W | 22½ W |
| 35 S | 30 E | 18¼ W | 19½ W | 20½ W | 21½ W | 22¾ W | 24¼ W |
| 35 S | 35 E | 21 W | 22 W | 22¾ W | 23½ W | 24½ W | 26 W |
| 35 S | 40 E | 22¾ W | 23½ W | 24¼ W | 25 W | 26 W | 26¾ W |
| 35 S | 45 E | 24¼ W | 25 W | 25 W | 26 W | 27 W | 26 W |
| 35 S | 50 E | 24¾ W | 25¼ W | 25¾ W | 26 W | 26½ W | 24¾ W |
| 35 S | 55 E | 24¼ W | 24½ W | 24½ W | 24¾ W | 25 W | 23 W |
| 35 S | 60 E | 23 W | 23 W | 23 W | 22¾ W | 22¾ W | 21 W |
| 35 S | 65 E | 21½ W | 21¼ W | 21 W | 20¾ W | 20¼ W | 18¾ W |
| 35 S | 70 E | 19¾ W | 19¾ W | 18¾ W | 18¼ W | 17¾ W | 16¾ W |
| 35 S | 75 E | 18¼ W | 17¾ W | 17¼ W | 17½ W | 16 W | 15¼ W |
| 35 S | 80 E | 16¾ W | 16¼ W | 15¾ W | 15 W | 14¼ W | 14¼ W |
| 35 S | 85 E | 15 W | 14½ W | 14 W | 13½ W | 13 W | 13½ W |
| 35 S | 90 E | 13½ W | 13 W | 12¾ W | 12½ W | 12 W | 12¾ W |
| 35 S | 95 E | 11½ W | 11½ W | 11¼ W | 11 W | 10¾ W | |
| 40 S | 0 | 2 W | 3½ W | 5 W | 6½ W | 7¾ W | 9¼ W |
| 40 S | 5 W | 0¾ E | 0½ W | 2 W | 3½ W | 5 W | 6¾ W |
| 40 S | 10 W | 3¼ E | 2½ W | 4¼ W | |||
| 40 S | 15 W | 5½ E | 0½ E | 1½ W | |||
| 40 S | 20 W | 8 E | 3¼ E | 1¼ E | |||
| 40 S | 25 W | 10½ E | 5½ E | 4 E | |||
| 40 S | 30 W | 12½ E | 8 E | 6½ E | |||
| 40 S | 5 E | 4½ W | 6 W | 7½ W | 9 W | 10¼ W | 12 W |
| 40 S | 10 E | 7¼ W | 8½ W | 10 W | 11½ W | 12¾ W | 14½ W |
| 40 S | 15 E | 9¾ W | 11¼ W | 12¾ W | 14 W | 15½ W | 17¼ W |
| 40 S | 20 E | 12¾ W | 14¼ W | 15½ W | 17 W | 18½ W | 20 W |
| 40 S | 25 E | 16 W | 17¼ W | 18½ W | 19¾ W | 21¼ W | 22¾ W |
| 40 S | 30 E | 19 W | 20 W | 21¼ W | 22¼ W | 23½ W | 25¼ W |
| 40 S | 35 E | 21¾ W | 22¾ W | 23½ W | 24½ W | 25½ W | 27 W |
| 40 S | 40 E | 23¾ W | 24½ W | 25 W | 26 W | 27 W | 28½ W |
| 40 S | 45 E | 25¼ W | 26 W | 26¾ W | 27½ W | 28¼ W | 27¼ W |
| 40 S | 50 E | 26 W | 26½ W | 27 W | 27½ W | 28¼ W | 26 W |
| 40 S | 55 E | 25¼ W | 25½ W | 25¾ W | 26 W | 26½ W | 24½ W |
| 40 S | 60 E | 24 W | 24 W | 24 W | 24¼ W | 24¼ W | 22¾ W |
| 40 S | 65 E | 22½ W | 22½ W | 22¼ W | 22¼ W | 22 W | 20¾ W |
| 40 S | 70 E | 20¾ W | 20½ W | 20¼ W | 20 W | 19½ W | 19½ W |
| 40 S | 75 E | 19¼ W | 18¾ W | 18¼ W | 17¾ W | 17¼ W | 18¼ W |
| 40 S | 80 E | 17½ W | 17 W | 16½ W | 16 W | 15½ W | 17¼ W |
Variation of the Magnetic-Needle, from the Islands of Orkney to Hudson's Straits, for the Year 1757.
| West Longitude From London. | Degrees of North Latitude. | ||||||||
| 56 | 57 | 58 | 59 | 60 | 61 | 62 | 63 | ||
| Degrees. | Degrees of West Variation. | ||||||||
| 4 | 18 | 18 | 19 | 19 | |||||
| 10 | 19 | 19 | 20 | 20 | 21 | ||||
| 27 | 24 | 24 | 25 | 25 | |||||
| 45 | 29 | 29 | 30 | 31 | |||||
| 55 | |||||||||
| 65 | 39 | 40 | 41 | ||||||
Variation in Hudson's-Bay and Straits, for the Year 1757.