. A directory for the North Atlantic Ocean, comprising instructions general and particular for its navigation. Pilot guides. GEOGEAPHICAL POSITIONS. 63 •upon a longitude of 71° 16' W. for Quebec. This was shown to be in error nearly 3^ minutes of are, by electric telegraph signals transmitted between Quebec and Cambridge Observatory, in Massachusetts, by Lieutenant E. D. Ashe, , in 1857. The position of Cambridge, as will be seen in the Note on that longitude on a subse- quent page, was settled as 71° 7' 58"55", and the mean difference between that Observa- tory and the Observato
. A directory for the North Atlantic Ocean, comprising instructions general and particular for its navigation. Pilot guides. GEOGEAPHICAL POSITIONS. 63 •upon a longitude of 71° 16' W. for Quebec. This was shown to be in error nearly 3^ minutes of are, by electric telegraph signals transmitted between Quebec and Cambridge Observatory, in Massachusetts, by Lieutenant E. D. Ashe, , in 1857. The position of Cambridge, as will be seen in the Note on that longitude on a subse- quent page, was settled as 71° 7' 58"55", and the mean difference between that Observa- tory and the Observatory in Mann's Bastion in the Citadel of Quebec, as determined by Lieutenant Ashe, is 0° 4' 84-17", which placed Quebec in 71° 12' 32-72". By the most recent observations, Quebec Observatory is placed in long. 71° 12' -20", as giveia in the Table. 3. Montreal.—The longitude of Gate Island, opposite the Cathedral and the Hotel Dieu, is given by Captain Bayfield in 73° 34' 38". Lieutenant Ashe, , as stated above, in continuation of his work on electric time-signals, obtained the difference of longitude between Quebec and Viger Square, 630 ft. West of Gate Island, on March 12th, 1857, as 2° 20' 45-5", which makes it in longitude 73° 33' 18-12". as shown in the Table. 4. Charlottetown and Prince Edward's Island.—The position of the flagstaff in the Fort of Charlottetown was given by Eear-Admiral Bayfield as lat. 46° 15' 55" N., long. 63° 7' 23" W. It had been before placed 3' more to the West, but the exact difference of longitude between this point and Quebec has been determined by the electric telegraph as 8° 5' 26". The Variation of the Compass is now decreasing on the shores of the Gulf and ilivei of St. Lawrence, at the rate of 1' per annum. 14. NOVA SCOTIA, &c.—(Southern Coasts.) LAT. AUTHORITIES. SABLE ISLAND [1] Lighthouse l^- mile from East end Lighthouse on West end NOVA SCOTIA. [2] Cranberry Island
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