Herschel, John F. W. (John Frederick William), Sir, 1792-1871 · London : Longman, Brown, Green, Longmans, and Roberts · leaf 526
r e A a, 5 B d} and inwards over a D b and dl&e. In virtue of the tangential force, then, the point H moves towards P when P is in AD, BE, and from it when in D B, E A, the motion being nil when at A, B, D, E, and most rapid when at the octant D, at which points, therefore, (so far as this force is… … E, and nil at a, b3 d, e. It will assist us in following out these indications to obtain a notion of the form of the curve
Astronomy
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