On Sun, 5 Jul 2020 at 10:40, Ed Minch wrote:
> Could the twist be the remains of a left-hand screw thread, used for screwing
on another piece?
>> I’ve showed this before but it is so cool that I will again
>> Ship fitter and pump maker, late 17th c, Rotterdam. Ships used pumps too
because at the time they leaked pretty horribly. And using trunnels to fasten
planks, one of them sprung pretty often. The pump augers appear to be all one
piece, but in Wilmington DE where I lived for 3 decades, they would still dig up
a piece of wooden pipe underground, sometimes 20 feet long.
That's really interesting.
I got this auger bit with another tapered spoon drill/reamer, same
characteristics: tang with notch, and it seems to be a left bit
too.The tip is damaged, but the end of the right edge is definitely
turning left when looking from the tang.
Is has no marking.
According to https://www.fomrhi.org/vanilla/fomrhi/uploads/bulleti
these were used by woodwind instrument makers.
Well, 2 more bits to go in my "weird looking bits" box.