No batteries! Now that's the way to be! Analog!
I was reading in Amundsen's book, "The South Pole"
Get it here- https://www.thenauticalalmanac.com/books.html
...that First Lt. Thorvald Nilsen led an oceanographic expedition in the Fram of the South Atlantic while Amundsen was heading South for the Pole. Prestrud in his portion of Amundsen's book (I hope I have that part correct in what I'm about to write) speaks of a similar device for depth sounding that you mentioned. I can't find the part of the book, presently, which mentions this. I think there was a glass tube lowered on a steel wire, which at a certain depth, would break and admit water into a container so they could measure either depth or take a sample of the water to check salinity.
Laugh all you want but my sailboat, small as it may be, doesn't have a knot meter. I simply count the time interval of an object (bubble, debris..anything) passing from bow to stern. Then I can tell how fast we're traveling. (It's a simple formula which has been precalculated).
In life using battery powered devices I've learned this lesson; whenever needed the most, at the moment of greatest urgency all electronics and battery powered devices will fail you.
More areas of the world were reached and conquered (so to speak) and so many accomplishments were made without electronics.
Joe, this site might interest you-
http://www.SurvivorLibrary.com/
Here's a section on Navigation-
http://www.survivorlibrary.com/index.php...navigation
Be good,
Fred
I was reading in Amundsen's book, "The South Pole"
Get it here- https://www.thenauticalalmanac.com/books.html
...that First Lt. Thorvald Nilsen led an oceanographic expedition in the Fram of the South Atlantic while Amundsen was heading South for the Pole. Prestrud in his portion of Amundsen's book (I hope I have that part correct in what I'm about to write) speaks of a similar device for depth sounding that you mentioned. I can't find the part of the book, presently, which mentions this. I think there was a glass tube lowered on a steel wire, which at a certain depth, would break and admit water into a container so they could measure either depth or take a sample of the water to check salinity.
Laugh all you want but my sailboat, small as it may be, doesn't have a knot meter. I simply count the time interval of an object (bubble, debris..anything) passing from bow to stern. Then I can tell how fast we're traveling. (It's a simple formula which has been precalculated).
In life using battery powered devices I've learned this lesson; whenever needed the most, at the moment of greatest urgency all electronics and battery powered devices will fail you.
More areas of the world were reached and conquered (so to speak) and so many accomplishments were made without electronics.
Joe, this site might interest you-
http://www.SurvivorLibrary.com/
Here's a section on Navigation-
http://www.survivorlibrary.com/index.php...navigation
Be good,
Fred