Many thanks Alpini, it makes sense now. Herewith three extracts from the volume, two look the same but have slightly different drawing numbers.
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Just want to link this post with my previous thread about the question if No.80 fuze did exist with Krupp fuze thread. The drawing from the Treatise on Ammunition which my question was based on could have it's roots in these drawings posted by @Bonnex. There are only very small differences. The direction of the graduation changed - maybe an adaption to the british traffic system
http://www.bocn.co.uk/vbforum/threads/80965-early-No-80-fuze-thread
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