Posting from rec.crafts.metalworking as always.
3019) An interesting device, and I'm going to make an assumption:
That the two tubes are joined in the bottom of the device, and
may even be a single U-shaped tube (depending on what liquid
medium is used in it.
The Joined tube makes a "manometer" which measures pressure by
displaying a different height on the two columns of liquid.
(You measure the heights of both, and subtract the lower from
If you are measuring a fairly high pressure, you would fill it
with mercury (Hg), likely to the 1-1/2" level to allow maximum
offset to be displayed. If mercury, the tube would pretty much
have to be continuous, as mercury attacks brass.
If a lower pressure, use water (perhaps with a dye in it to
If yet lower -- go to something less dense, such as an alcohol.
Since it does not appear to have a fitting for connecting to
something else, I'll suggest that it is intended to measure wind
velocity -- by pointing the snout towards the wind.
3020) This is a "planimeter". It is used for measuring the enclosed
area of a figure on paper or another flat surface. (This can
include areas of counties or states on a map, though the larger
the area vs that of the planet, the more error is introduced by
the choice of projection on the map.
I have one, and I seem to remember that you posted another some
You place a pivot (the disc in the left of the box, which likely
has three fine spikes to anchor it to the paper to avoid
slipping), pivot an arm from that, and connect the part with the
display to the first arm at another pivot (perhaps multiple
pivot locations, if it has adjustable scale factors). Then,
after zeroing the readout you trace the outline of the figure
with a pointer, and when you return to the starting point, you
can read the enclosed area. This one has a vernier to allow
dividing the "tenths" divisions on the drum into "hundredths".
The metal disk counts complete rotations of the drum.
Mine includes another disc with a pivoted arm which generates a
specific area for a complete rotation of the arm, so you can
check the accuracy of the reading.
3021) At first glance, these look like a lock picking set, but those
would not need the grip of the rubber handles, so I will suggest
that these are hooks for installing/removing springs in
something like typewriters, calculators, or other mechanical
devices (including, perhaps, old teletypewriters.)
3022) Looks like a table designed to clamp onto a vertical pole.
The shape of the cutout suggests square posts, but the clamp
pieces seem to be for a particular range of round ones instead.
It might be to cover a hole around a gutter downspout.
3023) This appears to be for bending levers (likely for pre-Selectric
typewriters). It looks like the gaps are 1/16" and 3/32", and
the heads are way too thick for it to be an open-end wrench.
I'm curious about the 3/4" wide 6" scale. I've never seen one
labeled "Sears" before. It looks like many others by many other
companies. The two which I have in my belt pouch are from
"General" and "Etched Products Corporation", and the former
looks like a match except for the name and the part number.
3024) This looks like a tool for turning a round tenon on the end of
something made of wood -- given the size, perhaps a spar for
sailing ships, or perhaps some of the rigging for drawing a
wagon by a team of horses.
Now to post this and see what others have suggested.
I heard back from the owner of this device, the tubes are connected at the
as seen in a new photo that is posted with the answers, and there is a hole in
stem that goes to the tube. Thanks to everyone who helped figure out this
The rest of the answers for this week can be seen here:
O.K. If the tubes are joined by the block at the bottom,
instead of being a single tube, this probably means that it is not
filled with mercury.
And for 3" difference with mercury, that gives only 1.47 PSI
maximum, and even model steam engine boilers work to near 100 PSI.
With water instead, it drops to 0.108 PSI. Totally useless for
measuring steam head in the boiler, but for checking flow of heating air
through the flues -- that would be a reasonable sensitivity. The units
program does not cover inches of methanol or inches of ethanol, other
likely liquids (though less likely than water, and the brass would show
discoloration from mercury, as it would get shiny for a short time, and
then dull and gray as an amalgam formed.
3021) I should have guessed the broken key extractors, though I have
never seen any.
Another application could be to check for small domestic gas leaks. You
connect it up, then turn off the gas supply and see if the pressure
drops over time. I've not done the calculations but they seem more in
the right range.
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