784 MODERN STEAM PRACTICE . “ Construction ( refer to Fig . 557 ) . — Draw a straight line OX as speed axis , and with a convenient scale of equal parts lay off from O , as origin , the respective trial speeds ; at each of which measure up - wards the difference of the logarithms of the… … Scale of Nautical Mlles . Fig - 557 - and speed . We at once perceive straight lines can be drawn which will pass through the respective set of points with a degree of accuracy which is surprising , when we consider not only have we many data , in which slight errors of observation will affect the…
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