TY  - JOUR
T1  - A New Apparatus for Drawing Conic Curves
JF  - Proceedings of the Royal Society of London. Series A, Containing Papers of a Mathematical and Physical Character (1905-1934)
VL  - 97
IS  - 683
SP  - 199
EP  - 201
PY  - 1920/04/15/
UR  - http://dx.doi.org/10.1098/rspa.1920.0026
M3  - doi:10.1098/rspa.1920.0026
AU  - Dufton, A.
ER  -