Brodetsky, Selig, 1888-1954 · London, G. Bell and Sons, Ltd. · leaf 108
90 WITH TWO PARALLEL SCALES whose coordinates are (^, >;). We shall find what relation there must be between the lengths a, h cut off on the a, h scales for all lines that pass through P. … Take the line through P given by a, h. The equation of this line is Y=h + {b-a)X, where {X, Y) are the coordinates of any point on it. Since P is on this line this equation also holds for (^, >]) the coordinates of P itself. This is true for all lines through P. Hence the a, b intercepts for all…
Nomography (Mathematics)
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