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Excerpt from Explanations and Sailing Directions to Accompany the Wind and Current Charts, Vol. 2: Approved by Captain D. N. Ingraham, Chief of the Bureau of Ordnance and Hydrography, and Pub. By Authority of Hon. Isaac Toucey, Secretary of the Navy
It has been claimed that the computed routes would, on trial and the long run, actually prove the shortest. They have done so. The crossings of the best six passages for each month, going and coming are given in the tables. The extreme difference between the crossings on the meridians of 40° and 45° for each month, both going and coming, are also given in the subjoined table. For the sake of the comparison, the difference between the mean crossing of the best six and the computed crossings are there given also. The crossings of 40° and 45° W. Are taken as the test, because, as already stated, they are about midway the ocean, where the departure of the actual from the computed route should be a maximum. It is a minimum at the ends, for there they all come together.
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