Каналовые поверхности Иоахимсталя с направляющими кривыми 2-го порядка

Joachimsthal's channel surfaces with the directrix curves of the 2-nd order

The geometry of the Joachimsthal's channel surfaces are investigated in the article. The equation of the surfaces in the lines of main curvatures are given. The polar equations of curves of the 2-nd order are used for directrix. The drawings of Joachimsthal's channel surfaces with parabola as directrix are shown for examples.