Statistics ? ---- "A numerical form of wish fulfillment". Just joking ! (an average joke ?).
I have a cylindrical slide rule, found in a junk shop. No identification, except "N 1010" on the bottom end, "OTIS KING'S PATENT No 183723" on the scale and "Made in England" on the top end. Steel hand hold, brass sleeve, ivory plastic scales. 6" compressed, 10" extended, 1" diameter.
Does anyone know of the whereabouts of a set of instructions, please, either for this model, or just a general description e.g. on the net ?
Apologies is off-topic, but you already seem to have got to the root of the quadratics question.