... attraction forward in the ship must act upon the needle in the nature of a compound force, and that errors produced by the attraction should be proportionate to the sines of the angles between the ship's head and the magnetic meridian." Experiments were made at Sheerness, Portsmouth, and Plymouth on five vessels. He took a keen personal interest in them; and the result was his invention of the Flinders' bar, which is now used in every properly ... — The Life of Captain Matthew Flinders • Ernest Scott
...
