I really did not believe it myself. Always thought camera threads were Whitworth. If I had not been playing with that head I still would. I don't know when the unified thread system was devised in camera history terms.
All I really know is that it was a committee decision to agree a form that would be common to America, Canada and Britain. I think there was a lot of American influence as it appears that eminent British engineers of the time thought it to be weaker than Whitworth.
Don
|