| 摘要 |
Apparatus for tracing elliptical curves comprising a T-shaped support member having perpendicular longitudinal and transverse branches and formed as a one piece injection molded body. The T-shaped member carries a point support on the longitudinal branch for piercing a tracing surface on which a curve is to be reproduced. Two sliders are respectively supported in recesses in the branches and the sliders are coupled together for correlated movement in the branches. A marking element is supported by the coupling for tracing a curve on the tracing surface in accordance with the movement of the sliders. |
