through an angle [theta] or a slope of one in m, given by
1 P P V
sin [theta] = --- = ----- = --- · -------- FQ sin QFF´, (3)
m wA·FK W Ak² - hV
where k denotes the radius of gyration about FF´ of the water-line
area. Burning the coal on a voyage has the reverse effect on a
steamer.