iiif tripod screw size

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For reference, here’s a picture from “Die Leitz-Werke in Wetzlar” ( Rolf Beck 2009).

Leitz apprentices being taught about different screw threads including “Whitworth”

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[Roland Zwiers]

Hello Alan,

Thank you, this is very interesting!
It shows that Leitz held the British Whitworth standard in high esteem;
it is mentioned in second position, immediately after the metric thread.

Roland