Kilopascal asked in USMA 10455:
>In the autumn of 1944 my father was in the US army ETO and at that time was
>in Paris. While there, he bought some souvenirs. One in particular that my
>mother still has is an inkwell. It had turned over the years from copper
>colour to black. She recently decided to paint it gold. She had me take it
>apart so she could do a proper job. The only thing that needed to be
>removed was Notre Dame which sat in the middle between the two ink wells.
>Notre Dame was held to the base by a single screw. Once apart I was curious
>to know what type of screw it was. Assuming it might be metric, I first
>tried to screw it into an M4 nut. It only went about 2 turns, then it bound
>up. I had no other screws to try and now that it is back together I won't
>have the chance to try it on other nuts. The screw is a round head, not
>pan, and the shaft length is 11 mm (not 10 mm). I checked that length a
>couple of times to be sure.
>
>What I'm curious about, is what fastener standard did the French use in that
>period? Could it be an American type screw? Could it have been British
>Withworth? Or could it have been metric with a thread pitch other than 0.7
>mm?
What is the exact diameter of the thread, and what is the ptich? Without
that information it is impossible to make a diagnosis.
