## Methods of ascertaining the distance from ships at sea |

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17 guns 51 guns 91 guns accuracy Alteration in Distance angle column angle DAE angle observed angle of depression angle of elevation angle of heel angle subtended ascer ascertaining the distance batteries Belcher's method applied calculated captain Carry the eye Corv cosines DISTANCE FROM SHIPS distance in yards Edward Belcher's Method embrasure enemy's mast-head enemy's ship enemy's water line foot in height Frig fuze gains and losses gun boats gunnery height column Horizon method Howard Douglas's method II.—SIR EDWARD BELCHER'S length Let the angle main topmast Main Trucks Masts or Yards method applied horizontally method applied vertically Method is adopted methods of ascertaining motion MTMC Natural Natural Natural obsd observe simultaneously observed angle observer on deck perpendicular sextant Ship 131 guns Ship 80 guns Ship 91 Ship 91 guns SHIPS AT SEA sight Sine Sir Edward Belcher's Sir Howard Douglas's smallest Sound travels taffrail true horizon wind

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Page 18 - ... the centre of the storm ought to lie at right angles to the direction of the wind, but from a table given by Capt. Toynbee, showing the result of one hundred and eight observations taken on board ships whose position with regard to the centre was accurately known, it seems that the average value of the angle between the direction of the wind and the bearing of the centre is 118°; that is to say, the average incurvature is 28°, or 2£ points. If this is correct, it follows that in whatever part...