I'll ask the owner of it to measure the increments to see what they are. No
verifiable answer yet for the garden tool but the rest of the answers for this
week have been posted.
Here is a patent applicatioin for a crack weeder tool that looks very much
like the other but with no wheels.
BTW the search terms crack and weed produce some interesting results.
Looks like the case is held only by a short notch
on the side away
from the pivot point. The tool point is pressed
into the primer and
then the case is pivoted out leaving the primer on
the tool. That's
how I see it anyway.... ;>)}
Neglecting the Berdan primers, part of which (the anvil) is in
the brass itself, a primer for brass cartridges consists of the cup and
the anvil, with the primer compound sandwiched between them.
However -- at least for the shotgun shell primers which I have
seen, there is another part -- sort of a high hat with a hole in the top
which receives the cup and anvil, and fits into the base of the shell.
One more part -- thus a *little* more complex. And it is this high-hat
cup which the spike could get under the rim of and crush, while it would
tend to just skate off the domed cup of the primer for brass cartridges.
(Yes, I know that there were brass shotgun shells at one time, but I've
never seen them -- and based on Wikipedia, they used primers similar to
the handgun primers of the period.
But what I remember was from the days of paper cases, and from
disassembling them as a kid. I can't find a web-based sectioned image
of the respective primers, and I'm not about to dive into ASCII graphics
for this. :-) I think that you'll agree with my description -- unless
they have changed yet again with the plastic shells used today.
BTW -- ever set off a small pistol primer with sunlight? I did
it with a plastic Fresnel lens (about 11x14" or so), and wound up with
the anvil going through the corner of the Fresnel lens. :-) (I would
advise safety glasses if you try it -- which I was not smart enough to
wear at that age. :-)
Ive deprimed many shotgun shells with a nail. I dont think Ive ever
seen a Berdan primed one. That..would be an interesting situation.
Ive forced primers to go off both accidently and intentionally many
many times...when I was much younger. I learned early, how dangerous
they can be if intentionally abused.
Here is the reply from the owner, the link below has a close-up of the company
"The tool measures in millimeters. The scale goes from 36mm to 44mm. These
numbers match the actual diameter of the circle as it is enlarged. It looks to
me like it measures something which has just a size variance of these 8 mm. It
would need to be something that is more ridged than an o-ring or a belt. The lip
in the lower part of the "calipher" is only 1/16 in. The tool measures the
inside diameter of a pipe, tube,or?? The name appears to be STACO but not sure."
2933 is, to me, reminiscent of a Whitney Punch:
Possibly some kind of early predecessor?
"I am not made like anyone I have seen; I dare believe I am not made
like anyone in existence. If I am not better, at least I am different."
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