NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Logs
From: Vic Fraenckel
Date: 2003 Jun 10, 15:20 -0400
From: Vic Fraenckel
Date: 2003 Jun 10, 15:20 -0400
As anyone who has read Patrick O'Brien's Aubrey/Maturin novels knows, the use of a log line is often mentioned. It is essentially a board with a bridle and a long knotted line on a reel. I surmise that the bridle was used to keep the face of the board perpindicular to the water flow in order to maximize the drag on the log. It was the midshipman of the watch to use the log to ascertain the speed of the vessel at periodic intervals. I am sure I am not telling members of this list anything they do not know! I would like to duplicate this speed log for my own sailboat. I understand that the log was tossed overboard and a 30 second sandglass was turned. The board pulled the knotted line off the reel and the mid counted the knots that passed thru his fingers during the 30 second interval. He then nipped the line which caused the board to become more streamlined (parallel to the flow) in the water and the line was reeled in. The number of knots counted equalled the speed. Is there a description somewhere that would tell me how to duplicate such a log? Any enlightenment will be appreciated. TIA Vic ________________________________________________________ Victor Fraenckel - The Windman vfraenc1@nycap.rr.com KC2GUI www.windsway.com Home of the WindReader Electronic Theodolite Read the WIND "Victory at all costs, victory in spite of all terror, victory however long and hard the road may be; for without victory there is no survival." - Winston [Leonard Spencer] Churchill (1874 - 1965) Dost thou not know, my son, with how little wisdom the world is governed? -Count Oxenstierna (ca 1620) to the young King Gustavus Adolphus