1557 is a black and white TV testpattern used to set the black ,white
and grey tones .
1560 is a machinists" jack used to adjut the level on workpieces on a
machine table .The Vee is used for round bar work pieces.
"I'm not young enough to know everything."
1555 I dunno why it was cut as shown... but I do question that the picture
is of one bolt.
I would question how you could cut one bolt to make the two pieces shown.
The left piece seens to have the cuts on the chamfered end. I can imagine
how to make the two pieces from two bolts with a saw.
I suppose there might be some situation where the two pieces, together,
might make a hard-to-remove setscrew.
1557 Indian Head Test Pattern
Lots of long-winded discussion in lots of places about how to figure out
what is wrong with your part of a television system and how to blame it on
1555: My guess is that its a type of lock-bolt. You start the lower
part into a threaded hole, then finish by twisting the top part down
into the hole, driving the lower part through until the top is flush.
When someone tries to back the top half out, the top section turns
60degrees, putting the top half threads and the bottom half threads
out of align, jamming the entire works in the threaded hole.
1558: No idea why, but something to do with cranberry raking comes to
1559: Obviously some sort of crimper?
This type of trick bolt is sold in novelty shops as a puzzle or magic trick.
When assembled, a nut covers the split in the bolt. The bolt is usually
inserted through a small ring and the nut used to lock the ring onto the
bolt. The puzzle is to remove the ring. The nut can only be removed by
holding the bolt in an unorthodox fashion (e.g, holding it tightly by the
ends between thumb and forefinger). If the bolt is held in the regular
manner, the nut locks in the manner you described.
I believe this is the correct description for the parts shown as #1555,
The part not shown is the nut. The set that I have includes a nut that is
about 3 times longer than a common size nut (and the overall bolt size is
The nut will screw onto the parts of the "bolt" effortlessly, and the
assembled parts look like a bolt and nut.
But when the nut is reversed to unsrew it from the "bolt", the end section
of the bolt locks the nut by a cam action of the machined lugs(?), and the
nut will not unscrew.
The person that knows it's trick bolt/puzzle can hold the hex (with the
little finger against the palm), and turn the end section of the bolt
clockwise holding it with the thumb and index finger (looking at the end of
the bolt), which prevents the cam action from locking the nut, so the nut
unscrews with no effort.
This is correct, although mine can't be solved by holding it tightly by the
ends between thumb and forefinger, the link that I'm planning to use on the
answer page also recommends this same solution but for some reason this
doesn't work for me. The only way to solve mine is to hold it by the small
end and then turn the nut with the other hand, or hold the nut and turn the
small end, as also suggested by Wild Bill.
More than that: a TV CAMERA test pattern. It was to focus and align
the electronics on old TV cameras in the studios. I worked in TV while
in college, and we'd focus our RCA cameras on the "bars and tone"
chart so the engineers could align the signal from the camera. The
test pattern was broadcast to the general public over the airwaves so
that they could also align the signal being sent out, but most folks
at home who go the test pattern (usually for 15 minutes before the
station went 'on air') probably thought the pattern was meant for
them. TV sets were self-adjusting well before this test pattern fell
out of use.
Just an aside but the page says "from the 1930s". While it was created in
1939 it was used into the '60s or early '70s (I wasn't keeping notes on such
things so don't recall exactly when I saw my last one).
There's an interesting wikipedia article on it.
http://en.wikipedia.org/wiki/Indian_Head_test_card. The guy who owns the
original artwork has a page on it at http://www.pharis-video.com/p4788.htm ,
and you can link from there to his page on the monoscope test camera of
which it was a part..
559 looks like a crimper to do standing seams on copper roof or terne
Don't quite know about the lute, could be for asphalt, Japanese garden
gravel, or getting the horse apples out of the show ring.
I was out to a conference last week...but here are this week's guesses:
1555 - Perhaps these formed some sort of a poor-man's mechanical
interlock or latch mechanism, with a non-pictured base with tapped holes
at various orientations. (They could also be used as a valve of some
sort, but I don't think they'd work too efficiently to be worth the
1556 - Umm, clamp-on spurs for part-time cowboys?
1557 - Ye famous olde "Indian Head" television test pattern, used to
adjust geometry, contrast, brightness, and measure (to some degree)
distortion and resolution. Still used well after the 1930's, I believe.
1558 - Rake (I assume for leaves or hay); the hinged comb I think is
designed to allow one to clear out the tines by pushing the rake forward
a bit after one or more pull strokes.
1559 - Seems to be a sheet metal crimper/bending brake, maybe for
forming/sealing the seams on metal roofing or flashing.
1560 - Adjustable mount for a tube, with fairly precise height
adjustment; I'd guess perhaps for use in aligning optical instruments
along the lines of rifle scopes.
Now to read the other guesses.
"He is no fool who gives what he cannot keep to gain that which he cannot
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