WW2 British Standards ARP Sign Measurements (1940)

I have a keen interest in the way fonts and lettering are generated and these pages from a British Standards book in 1940 detail the exact methodology used to generate the 1940s font used on ARP / Civil Defence / Fire signage.

Also included is the exact size of the various signs. I was somewhat confused why 7/8" was used instead of 1" on the Shelter 'S' signage but someone mentioned saving material (which makes sense) but it doesn't seem to follow through on vertical signs. 

​I'm including the files as downloads as well.

​Courtesy of Roger Miles.

british_standards_arp_signage_measurements_1.jpg
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british_standards_arp_signage_measurements_2.jpg
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British Standards ARP Signage Measurements 1

British Standards ARP Signage Measurements 2

British Standards ARP Signage Measurements 3