| 摘要 |
A drawing device for reproduction of divergent parabolas of the third order comprises a fixed horizontal rule, on which a lever with an arm is pivotally mounted and a vertical guide is installed, which are interconnected by a first slider dyad, to T-shaped slider of which a first crossbeam is attached, while the first, second and third crossbeams are in-series interconnected by the second and third slider dyads, one of the sliders of which is T-shaped. The drawing device comprises a vertical guide, the slider dyad and two T-shaped sliders. The vertical guides are mounted on a horizontal ruler. The lever has an additional arm, on which the T-shaped slider of the slider dyad is mounted; the other arm is connected to the third crossbeam by an additional slider dyad. The T-shaped slider of the second slider dyad is mounted on an additional guide. |
