Abstract
MR. FERGUSSON has apparently just discovered what everyone knew before, viz., that at the angle oof 45° the natural sine is equal to the natural ocosine, or the one is 100 per cent, of the other, and, being obsessed with the idea that the one great object in life is to work out percentages, he has taken the trouble to find the values of the natural cosines when the natural sine has any percentage from 1 to 100 to those natural cosines. He then divides the compass circle into octants, and each octant into 100 unequal parts, or percentages, and states that by the use of these percentages Traverse tables are no longer required.
Percentage Compass for Navigators, Surveyors, and Travellers.
By J. C. Fergusson. (London: Longmans, Green and Co., n.d.) Price, unmounted, 2s. 6d. net; mounted on linen, 3s. 6d. net.
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Percentage Compass for Navigators, Surveyors, and Travellers . Nature 91, 241 (1913). https://doi.org/10.1038/091241a0
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DOI: https://doi.org/10.1038/091241a0