Note 154 — Chapter XI · STEAM NAVIGATION—THE ‘GREAT EASTERN’ STEAM-SHIP, FROM THE COMMENCEMENT OF THE UNDERTAKING TO THE LAUNCH. A.D. 1851—1857. ÆTATIS 46—52.
Reading edition
Extract from memoranda of October 5, 1855:—
‘By constant observation, to lay down position and course of ship, and correct compasses.
‘To record speed of ship through water by logs.
‘Revolution of engines.
‘Force and direction of wind.
‘Draught and trim of ship, sails carried, &c.
‘Temperature and peculiarities of sea water.
‘As the result of these observations, to plot down hour by hour the position of the ship, to compute the speed, variations of compass, the direction and force of current, and true direction and force of the wind.’