Page:The open Polar Sea- a narrative of a voyage of discovery towards the North pole, in the schooner "United States" (IA openpolarseanarr1867haye).pdf/16

 is perhaps needless for me to observe that entire accuracy was not attainable in the field, inasmuch as I had neither the leisure nor the facilities for reducing the magnetic variation, nor for obtaining the absolute time. I am happy to say, however, that no greater discrepancy exists than the one which places my highest latitude two minutes too far south on the field chart; but the reductions having been made, and a chart projected therefrom, I had confidently relied upon this source for the correct information which the Smithsonian Institution now alone possessed. This failing me, I was obliged to fall back upon my original resources, as the time was too short for a new reduction. I am glad to say, however, that the field chart is sufficiently accurate for every practical purpose, and differs chiefly from the one prepared, with greater carefulness, and of large size, for the Smithsonian "Contributions to Knowledge," in the unimportant feature of the names applied to newly discovered places, some of which were changed after my return. No list of these alterations having been preserved, and being unable to get the more accurate map again into my hands from the Secretary of the scientific institution in whose care it had been placed, as before observed, for publication, I have simply adopted the original nomenclature, and have used the names as they appear in my journal and on my field chart. This explanation is made in anticipation of the possible contingency of the Smithsonian Institution publishing the map, for some years