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Number that denotes the position of a year in a system of 15-year periods, beginning 3 B.C.
Finishing off of a 'point' in end of rope by forming a footrope knot over the heart.
Error in sextant indication that is caused by refractive effect of glass roof of a mercury trough when using it as an artificial horizon.
Room and Space.
Longitudinal distance between centre lines
of ribs of wooden vessels
being width of rib
, 'space' being distance between ribs.
Elizabethan name for putting about before the wind. To 'put roomer' means 'to wear'.
The navigable water to leeward of a vessel.
Strong and turbulent current between Orkney and Shetland Islands.
Small, annular pieces of copper that fit over nail
ends in clincher-built craft
; over them the nail end is flattened to form clinch.
Small implement for holding a roove over end of a clinch nail. Has a hole in centre so that nail can be driven through roove.
and flexible lengths of wire
, hemp, cotton, coir, leather and other materials laid up for the transmission
of power and resistance
, while maintaining form at any angle of bending. Size is expressed by the circumference of the rope.
, ropes have a minimum
circumference of one inch
; smaller cordage being 'lines'.
Machine for laying up yarns and strands. Has circular framing with rotating hooks worked by a handle.
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