"daguerreotype" from 1830?

[James Harbeck]

Daguerre patented the Daguerrotype in 1839, but
there are daguerrotypes from before that -- he
was still developing it but there are extant
"daguerrotypes" from at elast 1837. Daguerre
started working with Niépce in 1929. But the
invention was announced by the French Academy of
Sciences on January 7, 1839, and AFAIK
daguerrotypes weren't really known well enough to
be a byword before then. So the 1830 date seems
no more likely than an 1875 reference to a
phonograph, though the April 1839 is reasonable.

James Harbeck.

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