Posting from Rec.crafts.metalworking as always.
1915) Looks like an expanding scraper to put a nice finish
on the ID of a bore.
Some, I've seen with flaps of sandpaper and rotated by an
electric drill or a drill press or milling machine.
This one is for a workpiece which is being rotated by ( perhaps )
Assuming that the image has not been reversed (they sometimes
have, here) it either is for a workpiece being rotated in
reverse on the typical lathe, or it is the leading edge of the
flaps which cuts -- and I would expect that to generate forces
beyond the ability to grip the wooden handle and prevent it from
rotating with the workpiece.
1916) A wrench for use by a firefighter. The smaller socket
(pentagonal) is for the valve stem on a fire hydrant, and I
think also fits the caps over the openings. The crescent is
probably for tightening the hose onto the hydrant. I'm not
quite sure where the big hex socket would be applied. Looks
like about 2-1/2" between flats, assuming that is a 2x4 that is
is resting on.
1917) Hmm ... designed to attract and trap flying insects like bees or
wasps? The sliding door is to release them into some other
container, or to free them -- or to allow smoking them into
insensibility for transfer to another container?
1918) To guide something like a large hose into a hole?
1919) For holding ground glass onto which an image is projected by
some other part not visible with a lens or a pinhole?
1920) One edge for cutting while rocking the blade (sort of like
an early pizza cutter), and the other end looks as though it is
for crimping a lid onto a container -- sort of like an oversized
cap for a soda bottle.
Now to see what others have suggested.
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I forgot that the owner of this device had given further description of it
in his email:
"There are two of them, they are a mirror image of one another (maybe right
Each segment has a "part number" BP 96, BP 97, BP 98 BP 99, BP100, BP
101, BP102,BP 103, BP110 and BP111.
The larger end is BP110 The smaller end is BP 111 and the center is BP100.
The ends are the only difference, they are reverse of each other large
to small. all part numbers are the same from left to right except the ends.
It springs shut but only opens as wide as I showed you in the pic.they
are not made of steel, it is an alloy maybe magnesium the springs are not
rusted so maybe stainless, but the pins are rusted a bit.
The parts are cast and then some machine work that appears to fit well
so fairly modern.
The other one (right) that I left at the store has what looks like some
sort of rubber cement on the flat side that I think is the bottom."
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