I teach a high school aviation program here on the field, and am new to the aviation world.
I recently purchased a vintage Kane Aero MkVI-B Dead Reckoning (E6B) flight computer. It is a work of art, all of the markings and writings are cut into the thick aluminum with a panto-graph engraver and then filled in with paint, man is it precise. On the "Wind" side, at the 6 o'clock position, opposite the True Index, there is a Temperature conversion scale, its on the outside stationary section butted up next to the compass rose rotating ring. Dead center of this temperature scale is indicated with a large black triangle with a zero inside it representing "0" Celsius, this triangle points upwards and touches the index lines for the degrees around the compass rose and it also has a R on the left side of the triangle and a C on the right side of the triangle. The Celsius markings are on the inside and the Fahrenheit are on the outside.
Nobody at my local airport has any clue as to what the purposes of the Triangle or the letters R & C are. Can you help ? Thank You
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