| Reversal. Difference in directions of surface and upper winds when exceeding 90°.
Reversed Frame 279 Riding Sail
Reversed Frame. Angle bar riveted to inboard edge of a frame so that its flange is in a direction opposite to that of the frame.
Reverse Laid. Said of ropes having yarns and strands laid up in the same direction. Sometimes called 'unkinkable' lay.
Revolving Storm. High wind flowing around an area of low pressure. Also called a 'cyclone'.
Rhodings. Brass bearings for axle of a pump wheel.
Rhumb. Line on surface of Earth, that cuts all meridians at a constant angle that is other than a right angle. A loxodromic curve. 2. One of the points of the compass other than a cardinal point.
Rhumb Line. Any part of a rhumb as projected on a chart.
Rhumb Sailing* Method by which a course and distance along a rhumb is converted into the resultant change in latitude and longitude.
Rib. Curved, transverse member, made of timber, going outwards from keel of a wooden vessel. Controls shape of the vessel and forms means of attachment of outside planking. In iron and steel shipbuilding it is replaced by 'frame'.
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