Concave mirror in early camera

I'm being driven mad by what may be a false memory.

I'm sure I can remember reading about a photographer who advocated a concave mirror based camera for portraits. I think this was in the period pre petzval or about that time. Were they produced commercially?

Can anyone remember a name or point me in the direction of something on the web. Searching for all the obvious words is getting me way too many false hits!

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