et F and F' (Fig. 9) be the two for since FM + F'M>FF' or 2«>2c or points, 2c their distance apart, and 2a «>c, for the first locus, in the second we the constant sum. Let us take for the axis of x the must have 2a<2c, since in any triangle the difference of two sides is smaller than straight line… … Fig.9 than the one corresponding to the orig- inal enunciation. We see plainly that it The condition to which it is subjected is introduced by the elimination of radi- will be expressed by the equation, cals, so that eq. (2) the so-called " conse- FM + F'M=2a, quence " of (1) (see articles 19 and…
Engineering
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