robtherake
Well-known member
It was mentioned that the best way to find the position of underground springs - possible winter hotspots - was to observe which areas froze last in cold weather.
I guess the only way to do that under more normal conditions, apart from observing for signs from fish, is by thermometer. I remember reading something written by one of the old-time greats - maybe Walker, talking about the perch at Arlesey - mentioning the use of a caged thermometer to map temperature variations.
It should even be possible - in conjunction with a hefty float - to check the difference at various depths, although I'm now straying from the point a little.
What I'd like to know is if anyone on here has used one, how accurate they are and whether there's a particular type or brand to look for which is more reliable than any other.
I guess the only way to do that under more normal conditions, apart from observing for signs from fish, is by thermometer. I remember reading something written by one of the old-time greats - maybe Walker, talking about the perch at Arlesey - mentioning the use of a caged thermometer to map temperature variations.
It should even be possible - in conjunction with a hefty float - to check the difference at various depths, although I'm now straying from the point a little.
What I'd like to know is if anyone on here has used one, how accurate they are and whether there's a particular type or brand to look for which is more reliable than any other.