Issue No. 06 - June (1970 vol. 19)
An inexpensive computer graphical input device giving Cartesian coordinates with better than 1-mm resolution is described. The technique works equally well for two-or three-dimensional input variants of the device.
Digital stylus, graphical input, sonic pen, three-dimensional input, two-dimensional input.
P. de Bruyne and A. Brenner, "A Sonic Pen: A Digital Stylus System," in IEEE Transactions on Computers, vol. 19, no. , pp. 546-548, 1970.