Abstract
1. MY first attempt at photographing the fixed lines of the spectrum was made in 1834. It was on paper covered with silver bromide. As mentioned in the Philosophical Magazine, May 1843, it proved to be a failure. In the summer of 1842, simultaneously with M. Becquerel, by using daguerreotype plates, I succeeded, and in the following March sent a drawing of the photograph to the Philosophical Magazine, which was published in May. At that time I did not know that M. Becquerel was experimenting in the same direction.
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