I looking to find out how a pre-1950 Aircraft Air/Fuel ( military) mixture gauge worked. The gauge portion of this technology has two pins and a case connection (three connections in all).
I looked at several web sites for current technologies which seem to be all based on the measurement of outside air oxygen to the oxygen left over in the exhaust. But further research looks like current technologies were based on an O2 sensor built by Bosch of Germany many years after 1950. I could not find any references to technology used before that time.
Does anyone have an idea of the technology used at that time and or does anyone have any idea as to where I could go in my search?
reh
By: aircraftclocks - 22nd April 2008 at 11:13
Cambridge Aero mixture indicator
Rehlombard
It has taken me a while to locate the book that has all the detail you require.
In the book, Pilot’s and Mechanics Aircraft Instrument Manual, by G.C. DeBaud, The Ronald Press Co., New York, 1943, there is 18 pages on the Cambridge Aero Mixture Indicator. It goes into a lot of detail as to how it works, testing and trouble shooting, and how to connect for a variety of aircraft configurations.
The system works on the Wheatstone bridge principle. 2 legs of the bridge have identical platinum coils located in cells, one cell is connected to the exhaust and the other to a known gas located with in the cell.
A little more detail is described in this link.
http://www.tighar.org/forum/Highlights101_120/highlights105.html#17
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March 28, 2008 at 7:48 pm