correction Re: Opposite of micro

>>Carl,
>>
>>What is a "Vandervoort keyboard", please?
>
>Hi Yahya,
>
>I suppose it's any keyboard designed by Paul Vandervoort. In this
>case, I'm referring to a Janko-layout mechanical action that uses a
>(patetend) mechanical parallelogram linkage to equalize the key
>travel from the front to back of the keyboard. Norman Henry and I
>have one of these actions here in the Bay Area, but it's designed to
>fit a Knabe (IIRC) grand, which we don't have.
>
>-Carl

Paul writes...

""Actually, I know of no in-force patent on the parallelogram linkage.
This is an old idea, going back at least as far as Leslie F. Astell's
United Kingdom patent #737,268, published in 1955.

And Raffali's U.S. patent from 1968 is long expired:
*http://tinyurl.com/bane7*
""

I think it was Astell's in the Jennings Univox, a kind of English
monophonic pushup organ like a Hammond Solovox, but the action was
assigned to and probably manufactured by Herrburger Brooks. It's a
four link mechanism like a pantograph, a stationary flange is screwed
to a rail and a moving flange fixed to a projection on the key
connected by two indentical, parallel abstracts pinned at both ends.
The patent illustrates a single coil spring acting between the key and
the rearward placed stationary flange, and incorporates a simple
switch. There will be some small rotary motion but it is a compact
arrangement that allows uniform motion to the entire surface of the
key.

Clark