A Compilation of the Messages and Papers of the Presidents. Volume 4, part 2: John Tyler

by Unknown

Grand Falls of the St. John, including the intersection of that river by the north line; islands of the St. John; the outlet of Lake Pohenagamook; the turning point of the boundary on the Northwest Branch of the St. John; the intersection of the Southwest Branch by the parallel of latitude 46° 25'; the source of the Southwest Branch; the source of Halls Stream; the intersection of Halls Stream by the west line; Rouses Point; St. Regis; Derby.

But similar maps have not been prepared by the American commission, because during the interval between the finishing of the maps of the British commission and those of the American it was thought that the maps already constructed upon a scale of 4 inches to 1 mile represented the boundary with sufficient clearness and accuracy.

The astronomical observations were begun at the Grand Falls early in June, 1843, and were carried up the St. John River to the Northwest Branch by a chain of stations, which, together with the results obtained, are tabulated in the appendix accompanying this report.

From the valley of the St. John an astronomical connection was made with Quebec, and thence to Montreal, and so to Rouses Point. From Rouses Point a connection was obtained with Cambridge University, near Boston.

The astronomical stations on the west line were: Intersection of Halls Stream by the west line, Lake Memphremagog, Richford, Rouses Point, John McCoy's, Trout River, St. Regis.

Latitude was also obtained at an astronomical station established for the purpose at the head of the Connecticut.

Volumes containing the astronomical observations of both commissions are herewith submitted. From them it will be observed that the results for absolute longitude obtained by the British and American astronomers do not agree. It being a difference in no way affecting the survey of the boundary line, the undersigned do not feel called upon to attempt to reconcile it. The data upon which those results are based may be seen in the volumes of observations accompanying this report.

In the appendix will be found, in a tabular form, the following:

An abstract of the survey of the boundary along the north line; an abstract of the survey of the boundary along the southwest line; an abstract of the survey of the boundary along the south line; an abstract of the survey of the boundary along the highlands; an abstract of the survey of the boundary along the west line; the position of the monuments erected on the Southwest Branch of the St. John and on Halls Stream; the distribution of the islands of the St. John and the monuments on them; the guide lines and offsets run by each commission for the survey of the highlands; the azimuths of verification for the survey of the highlands; the latitudes and longitudes obtained from the astronomical observations; the comparative longitudes obtained, and the methods used for the purpose.

Upon comparing the maps of the two commissions it will be seen that the American commission numbers two monuments more than the British. Those are to be found, one on the "Fourth Island," in the river St. John, and the other on the highlands between the source of the Southwest Branch of the river St. John and the Kennebec road.