TY  - JOUR
T1  - On an Instrument for the Composition of Two Harmonic Curves
JF  - Proceedings of the Royal Society of London (1854-1905)
VL  - 22
SP  - 196
EP  - 199
PY  - 1873/01/01/
UR  - http://dx.doi.org/10.1098/rspl.1873.0027
M3  - doi:10.1098/rspl.1873.0027
AU  - Donkin, A.
ER  -