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By George Sale, George Psalmanazar, Archibald Bower, George Shelvocke, John Campbell and John Swinton.

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Extra resources for An Universal History from the Earliest Account of Time to the Present - 1744 - Folio Edition - Volume Five

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The large range hand rotated at a rate set by the handle to the right; thus the hand indicated the changing range on the circular scale. The range scale could itself be rotated by a second handle; thus it was easy to alter the range until the hand pointed to the corrected value. The range-rate set on the clock was obtained from the Dumaresq. If the clock rate could have been adjusted continuously to follow that indicated by the Dumaresq, the clock-range would have changed at exactly the correct rate.

But, as plotting proceeded, their general trend became increasingly apparent and it was possible to make out the mean line about which the points were scattered. Depending on the nature of the plot, this line could be straight or curved: though it was always easier to make out (or, put another way, it could be made out earlier) if it was straight. This mean line gave an approximate indication of the true line that would have been plotted if the data had been error-free. A particular advantage of plotting was that each point could be assessed visually against the general trend and given less weight, or even ignored altogether, if it appeared anomalous.

Assume that the bearing of the moving ship from the stopped one is expressed as a compass-bearing, which is positive when measured clockwise from True North; then if the first ship is moving from left to right, his bearing always increases, though it does so most rapidly at the point of minimum range. e. when their relative movement is expressible as a virtual course-and-speed. e. the angle from own ship’s nominal or mean-course to the line-of-sight. Moreover, while own course is steady, the changes in both these bearings are the same.

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An Universal History from the Earliest Account of Time to the Present - 1744 - Folio Edition - Volume Five by George Sale, George Psalmanazar, Archibald Bower, George Shelvocke, John Campbell and John Swinton.


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