TY  - JOUR
T1  - On Certain Improvements on Photographic Processes Described in a Former Communication.
JF  - Abstracts of the Papers Printed in the Philosophical Transactions of the Royal Society of London (1800-1843)
VL  - 4
SP  - 398
EP  - 399
PY  - 1837/01/01/
UR  - http://dx.doi.org/10.1098/rspl.1837.0206
M3  - doi:10.1098/rspl.1837.0206
AU  - Herschel, J.
ER  -