JF Ptak Science Books: War Gas Paper Calculator, 1942

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War Gas Paper Calculator, 1942

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I found this very interesting paper calculating device (ca. 1940) on the Imperial War Museum site (here):

I came to the IWM site via the St. Marylebone WWII site and the section on Air Raid Protection because of unearthing this elegant sticker in one of my pamhlets:

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War Gas Paper Calculator, 1942

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