 | John Fry Heather - 1851 - 156 páginas
...of the generation of this curve, it is very easy to draw a tangent to it by the method of Eoberval. In fact, since the length of the string is constant,...it to the construction of the tangents to curves of double curvature. In fact, if a generating point is moved in space in such a manner that at each instant... | |
 | 1897 - 528 páginas
...at this point. It is clearly seen from this, that in the ellipse the tangent bisects the angle BPN, formed by one of the focal distances and the production of the other, ' ' etc. , etc. Mr. Heather elsewhere explicitly states that if the components in two directions are... | |
 | Charles William MacCord - 1901 - 148 páginas
...FIG. 13. point. It is clearly seen from this, that in the ellipse, the tangent bisects the angle BPN formed by one of the focal distances and the production of the other," etc., etc. Mr. Heather elsewhere explicitly states that if the components in two directions are given,... | |
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... AM produced, and the parallelogram MPEQ, be completed, the diagonal ME of this parallelogram will be the direction of the motion of the generating point at M, and consequently the tangent to the curve at this point. It is clearly seen from this, that... 