Re: Bausch and Lomb DuBoscq Colorimeter

Roger,

This is not a colorimeter in the sense of the word that you recognize. In
the early days of analytical chemistry, any instrument for reading the
visible transmittance of a chemical solution - for the purpose of
determining the concentration of the solute - was known as a colorimeter.
The design of this instrument dates to 1870 - well before the development of
the CIE system of colorimetry. See the following link for further details.

http://humboldt.edu/~scimus/HSC.36-53/Descriptions/Color_B&L.htm

Danny Rich

"Roger Breton" <graxx@xxxxxxxxxxxx> wrote in message
news:BF522710.125DE%graxx@xxxxxxxxxxxxxxx
> Was this one of the first "visual" colorimeter, introduced after adoption
> of
> the 1931 Standard Observer?
>
> http://cgi.ebay.com/Antique-Bausch-and-Lomb-DuBoscq-Colorimeter_W0QQitemZ620
> 8429784QQcategoryZ14023QQssPageNameZWDVWQQrdZ1QQcmdZViewItem
>
> Roger Breton
>


.

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