LOG BOOK. A ship's journal. It contains a minute account of the ship's course, with a short history of every occurrence during the voyage. 1 Marsh. Ins. 408. When a log books required by law to be kept, it is an official register so far as regards the transactions required by law to be entered in it, but no further. Ab. Sh. by Story, 468, n. 1; 1 Sumn. R. 373 2 Summ. 19, 78; 4 Mason, R. 544; 1 Esp. R. 427.