TY  - JOUR
T1  - A Letter from Mr. George Edwards, F. R. S. to Thomas Birch D. D. Secret. R. S. concerning An Observation Made by Him in Opticks
JF  - Philosophical Transactions (1683-1775)
VL  - 53
SP  - 229
EP  - 230
PY  - 1763/01/01/
UR  - http://dx.doi.org/10.1098/rstl.1763.0036
M3  - doi:10.1098/rstl.1763.0036
AU  - Edwards, G.
ER  -