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The sextant (or perhaps "quadrant" would be more correct) consists
of a right angled frame subtended by a protractor, similar to a
normal sextant. At the end of each arm of the right angled frame
is a mass held by a spring in a slider. Both of the sliders are
parallel to one of the arms, as illustrated below:
Oriented so that the plane of the sextant contains the center of the
field source, rotate the sextant until the displacements of the masses
in the two sliders are equal, and then sight the field source on a
line through the corner of the frame, and mark the angle on the
protractor.
The angle "theta" between the line of sight and the slider direction
is related to the exponent c in the force law according to the equation
tan^2(theta) + (c+1)tan(theta) - c = 0
For example, if the angle reads 29.3165 degrees, then…