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CONT? Nl Variation of the Compass, 8, 4. To correct a Compass course for variation, 4. To correct a Compass bearing for variation, 4. Chart of magnetic variation for the lakes, 5. To shape a Compass course corrected for variation, 6. Deviation of the Compass on iron and steel ships, 6. : The magnet, 6. Compass needle, 6. Semicircular deviation of the compass, 7, 8. To correct a compass for semicircular devia- tion by two magnets, 8, 9. Quadrantal deviation, 9. Heeling error, 10. Deviation of the Compass on wooden ships, 10. Directions for ascertaining the deviation of the Compass by swinging the ship, 10, 11. Directions for correcting a Compass course for deviation, 12. To correct Compass bearings for deviation, 12. To shape a Compass course corrected for deviation, 13. To correct a Compass course at once for both deviation and variation, 13. To shape a Compass course corrected at ouce for both deviation and variation, 14. Directions for passing buoys, 17. Directions for marking the hand, and deep sea lead line, 18. ST. LAWRENCE RIVER. Lights, buoys, sailing directions, etc., 21 to 29. LAKE ONTARIO. Lights, buoys, harbors, etc., on the east and south shores, 29 to 36. Compass courses and distances on the south shore, 36 to 40. Compass bearings and distances from lights on the south shore to lights on the north shore, 41. / Magnetic declinations, 41. Lights, buoys, harbors, etc., on the north shore, 42 to 49. Compass courses and distances on the north shore, 49 to 52. NIAGARA RIVER. Lights, buoys, and sailing directions above the Falls, 52 to 56. LAKE ERIE. | Lights, buoys, harbors, etc., on the south shore, 56 to 73. ae Compass courses and distances on south shore, %3 to 79. ; eee declinations, 79. Lights, buoys, harbors, etc., on the north shore, 79 to 83. Compass courses and distances on the north shore, 83 to 85. Bree at the mouth of and in Detroit river, 85 o 87, DETROIT RIVER. Lights, buoys, and sailing directions, 88 to 92. LAKE ST. CLAIR. Lights, buoys, courses and distances, etc., on both shores, 92, 93. ST. CLAIR FLATS. Lights, buoys, etc., 93, 94. ST. CLAIR RIVER, Lights, buoys, etc., 94 to 97. LAKE HURON. Lights, buoys, harbors, etc., on the American shore, 97 to 108. Compass courses and distances on the Ameri- can shore, 108 to 112. - Magnetic declinations, 113. Lights, buoys, harbors, etc., on the Canadian shore, 113 to 116. Compass courses and distances on the Cana- dian shore, 117 to 119. ~ GEORGIAN BAY AND NORTH CHANNEL. Lights, buoys, harbors, and sailing directions, 120 to 152. Compass courses and distances, 153 to 157. STRAITS OF MACKINAG. ~~ Lights, buoys, harbors, etc., 158 to 164, Compass courses and distances, 198 to 201. LAKE MICHIGAN. Lights, buoys, harbors, etc., on the east shore, 164 to 176. Lights, buoys, harbors, etc., on the west shore, 176 to 191. ' Compass courses and distances on both shores, 202 to 213. Magnetic declinations, 213. GREEN BAY. Lights, buoys, harbors, etc., 191 to 198. Courses and distances, 213 to 217, Magnetic declinations, 217. STRAITS OF ST. MARY, Lights, buoys, etc., 219 to 222. LAKE SUPERIOR. Lights, buoys, harbors, etc., on the American shore, 222 to 239. Lights, buoys, harbors, etc., on Isle Royale and Passage Island, 240, 241. coer and distances on both shores, 24! te Magnetic declinations, 249, Lights on the Canadian shore, 250, 251. [1]