How much use is a 60-year-old guide to film speeds?  Not that much, at first sight, but it's of interest to photo historians and those with elderly Weston meters. On page 22, too, there's some good information about how to meter in very dim conditions. 

It reminds us how many film manufacturers we've lost, and how slow films were in those days, though admittedly this was before the Great Revision of about 1960 when the "safety factor" (for under-exposure) was reduced by one stop and film speeds were immediately doubled.

Happily, Weston is still in business, still in Port Glasgow, but it has been some time since they made exposure meters. I hope this copy of one of their old instruction books may deflect at least some of the queries they must still from time to time receive.

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