H and D Curve and the ISO Scale equivalents?

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From: Ray Rogers (earthsoda@yahoo.com)
Date: 02/11/00-02:34:06 PM Z

Hi!
I was wondering if anyone knows just when we began to
use ASA numbers? I was looking at 1939-1950 magazine
ads for Ansco and Kodak sensitive materials and the
the lack of speed information is, well, noticeable.

Any one know of a chart listing the equivalent speeds
for the former H&D speeds with the ISO (or ASA)
speeds?

Thanks... and sorry about the off topic(?)subject, but
the recent inquires of that um... commercial entity
just seemed to open this can of worms...that stuff
about international standards of light and...well if
you have any information, use your own discretion as
to whether it should go on or off list. Thanks.

Ray
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