Brodhead Pietenpol Association

Original Posted By: Barry Davis
The key word in Max's post is that these are "magnetic". I beleive the Rochester gauge uses a magnet at the end of the spiral rod. Thepoles of this magnet align with another magnet that is attached to the indicatingcard. The magnet on the spiral is in the gas. Then there is the aluminumof the housing and then the card is "outside" of this housing in the air, balancedon a point as is a compass. There is no way for fuel to leak out ever!Hence, the "hermetically sealed" statement. The magnetic field carries throughthe aluminum of the housing to enable this. Once the poles of the two magnetsalign, they don't move out of alignment at all. It remains rigid in the magneticflux.This is the way the fuel gauges in the P-51 Mustang and the PT-19/22/26 worked.Look at one if you ever get the chance. Max, confirm this is the way they are constructed. I am quite sure from the descriptionthat this is the case. If it is indeed true then it is the way to go.These would be the most superior of the float style gauges to use!chris bobka ----- Original Message -----

Original Posted By: "walt evans"
Subject: Pietenpol-List: Re: Magnetic gaugeIn a message dated 2/27/2004 9:34:54 PM Central Standard Time, bobka(at)compuserve.com writes:> The key word in Max's post is that these are "magnetic". > > I beleive the Rochester gauge uses a magnet at the end of the spiral rod. > The poles of this magnet align with another magnet that is attached to the > indicating card. The magnet on the spiral is in the gas. Then there is the> aluminum of the housing and then the card is "outside" of this housing in the> air, balanced on a point as is a compass. There is no way for fuel to leak out> ever! Hence, the "hermetically sealed" statement. The magnetic field > carries through the aluminum of the housing to enable this. Once the poles ofthe > two magnets align, they don't move out of alignment at all. It remains > rigid in the magnetic flux.> > This is the way the fuel gauges in the P-51 Mustang and the PT-19/22/26 > worked. Look at one if you ever get the chance. > > Max, confirm this is the way they are constructed. I am quite sure from the> description that this is the case. If it is indeed true then it is the way > to go. These would be the most superior of the float style gauges to use!> > chris bobka> Chris,You have described this gauge perfectly, and also why I am so interested in it.Max,Arlington, TX.________________________________________________________________________________