A few weeks ago I posted links to three photos that were not included on my site, I have added one of them to this week's set for the benefit of those who do not follow the discussions here in the newsgroups.
854 pasta maker, to cut the dough (? paste ? which is the right word? in german: Teig) to spaghetti
857 micrometer, to measure the height, with a accuracy within the range of a thousandth millimeter or better
859 some early type of electrical relay
O.K. Posting from rec.crafts.metalworking as usual.
853) Interesting. Looks sort of like a key, except that when it is turned counterclockwise (from the spring end), it will cam in and press the screwdriver tip harder into the slot in which it is (presumably) engaged.
Not really sure why the spring around the rest of it.
854) for guiding a set of lines (ropes) parallel. Perhaps for winding a rope evenly on a drum -- though I would expect a mounting instead of a handle for that.
855) Looks like a tool for nipping a nail or a rivet to length.
Not sure what the plates below it are for. Perhaps jaws for *pulling* nails?
856) No clue -- and it is way too late to take more time trying to guess.
857) A device for measuring thickness of materials -- 0 to 1/4" (0.250"), in both 0.001" increments, and in fractional inch increments of 1/64th of an inch.
858) Another version of a "cork socker" -- a tool for re-installing a cork in a wine bottle. It looks closer to the one which I have had since about 1970 or so, except that mine is dark wood. This is the second of these in the past month or two, IIRC.
859) A relay for interrupting current through an inductive load, or for fairly high voltage. (This because the double set of contacts in the current path doubles the opening that the arc needs to jump to keep the current flowing.
Now to see what others have answered, and then go to sleep. :-)
My first thought was for a firing pin too (as several others have suggested), but...
The business end looks like one used for a rimfire, but wouldn't a rimfire pin be offset to hit the rim? This one looks to be centered.
Most firing pins I have seen are longer in the narrow striking area. There wouldn't be a whole lot of room behind this one for the bolt to contain pressure.
Just some thoughts, I don't have a better answer...
The answer page has been posted though I'm still not sure about the first two for this week, also I have included an update on the scriber from a few months ago:
Actually, by definition 857 IS a micrometer. So is your example. So is an instrument that measures small increments of ANGLE. Lots of things qualify as "micrometer"
... which says "especially one based on the rotation of a finely threaded screw". That's the only definition of micrometer that an engineer would understand. Dictionary definitions are all well and good but many of them are either too new to be in common usage or too old and no longer in common usage. To an engineer a micrometer has a thimble and anvil and a dial gauge has ummm... a dial.
-- Dave Baker Puma Race Engines
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Camp USA engineer minces about for high performance specialist (4,4,7)
O.K. I have no experience with disassembling a Krag (which I thought used a centerfire cartridge, and this is for rimfire from the shape), but I do know that at least it is *not* the firing pin for the HILTI model DX-350, which I have, and which I just disassembled to refresh my memory. I don't know how many other models of nailset guns HILTI may have made.
I do agree that it is probably a firing pin for some flavor of rimfire weapon.
I agree. In the field in which that instrument was used, it would not be called a "micrometer". "dial thickness gauge" would be the most likely term. It has a lower range, and requires less skill to read than a micrometer would. That covers 1/4th of the range of the typical micrometer.
Early yesterday morning I changed my answer to "thickness gauge", I agree that micrometer wasn't the best description for it, though some tools go by several different names depending on where you live, so I tend to be more concerned about the use for a tool than what it's called.
I also modified my answer for the firing pin, and added the link below that explains rimfire ammunition:
853. I think it's a firing pin for a Gatling gun. Have not found a picture of the exact part, but Gatlings original patent (36,836) shows the pin for a percussion version. It is NOT the firing pin for a Krag.
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