I suspect that this is for setting the depth of cut on a woodworking plane
There are better pictures of some out on the net.
From what I see, the little tab on the upper left can move relative it the
to the bar that runs down the remainder of the left side. This movement is
magnified by gears or linkages to the pointer.
I have several old test indicators that work on the same principle.
If you lay the stationary bar on the infeed side of a planer and the tab on
the outfeed, as you lower the infeed table the depth of cut would read off
Paul K. Dickman
Posting from rec.crafts.metalworking as always.
2869) Hmm ... looks like some kind of arc with the third electrode
at an angle used to inject a high voltage spike to start the
From the size of the bulldog clip, it is fairly high current,
but not excessively high.
I presume that the ring is something like Bakelite (a fiber
2870) This could be anything -- including something made just to
prove that you can do it as a test of the material or the
2871) Looks like something which could slide in one direction along
a wood beam, and lock when slid in the other direction.
2872) A small force gauge, and given the size, it could be a stylus
pressure gauge (for phonograph needles). Depending on the
vintage, the scale could be in ounces, or grams -- more likely
2873) Hmm ... perhaps a shock mount for attaching a pocket watch to
the end of a cloth ribbon style of fob.
2874) This one, at least, is quite clear -- one of two very similar objects:
a) An air chisel (minus the chisel blade which fits in
the spring retainer).
b) An air riveting tool.
The difference between the two is length of stroke and number of
beats per minute, I believe.
Now to see what others have suggested.
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