Willesden Canvas. Treated canvas, green in colour, often used for tarpaulins.
Williamson Turn. Used to turn a vessel 180° and bring on to her original track. The wheel is put hard over until the heading has altered about 60°. The wheel is then put hard over in the opposite direction until the heading is approaching the reciprocal of the original course and the vessel is steaming into her wake.
Willis Altitude Azimuth Instrument. Small instrument for obtaining, mechanically, altitude and azimuth of a heavenly body from its declination and hour angle, and latitude of observer.
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