3124 This is a Necker Knob. It clamps on to a car steering wheel, so
that the driver can steer with one hand while the other hand is
otherwise occupied. They sort-of faded into obscurity with the
introduction of power steering.
Truck drivers have also occasionally used them.
3121 This is a four-terminal resistor. It is used in precision
measurement. The current goes in and out through the large outer
terminals, and voltage is measured across the puny inner terminals.
This separates the effect of voltage drop across the current terminals
from the true voltage at the inner terminals.
Posting from my desk top PC in the living
room, as always. Windows XP is getting old,
some help wanted web sites won't upload resume
with this OS.
3121, fixed value resistor, for testing equipment.
3122, my gut sense is this is a lens for movie
3123, be interesting if the solid end was open
socket of some kind. Not familiar.
3124, fence repair tool. Turn the black knob to
tighten the two straps to hold the fence wire.
3125, fence repair tool. Clips off the ends of
fence posts and catches the pieces.
3126, maybe burner gun from a natural gas
This is the combination wrench/handle of a cleaning rod for a
semi-automatic military rifle or machine gun. The wrench end is for
removing the gas piston for cleaning also. Don't know for which one
exactly as there is a lot of similarity between them.
At the age of ten I was driving all sorts of vehicles on the farm. One
was an old three ton truck, manual everything. I had to hold on to the
suicide knob with both hands to turn the wheel when the truck was
stopped or moving slowly in bullow.
A bit more info.
Posting from the usenet newsgroup rec.crafts.metalworking as always.
3121) A current-measuring shunt resistor.
The current is applied to the two large binding posts and goes
directly into the ribbon of metal.
The two small binding posts are connected to the ribbon via what
appears to be spot welds (the small wires about an inch from
each large binding post).
The position of the spot welds is to set a precise resistance so
you have a precise voltage across the small binding posts for a
Most current shunts are for 50 mV at the full rated current, but
this looks like a significantly larger resistance for the
current capability of the metal ribbon and thus a higher
voltage. It might be as high as 1V at fullrated current, which
suggests that it was also used in circuits with relatively high
3122) This looks like part of an early and special purpose color
TV camera. Each lens focuses onto a different B&W videcon,
through a different color filter, and the different apertures
are to balance out the relative light loss in the filters.
If the lenses were larger and more widely spaced, I would think
that it was an early projection TV -- back when there were three
different CRTs, each with a different color phosphor.
At a guess, this was for converting movie film to video tape.
3123) This looks like a throttle lever for a multi-engine aircraft.
3124) A "Necker's Knob". It clamps onto a steering wheel allowing
the driver to steer with a single hand, while the other arm is
around his girlfriend.
They were common in the 1950s and maybe the early 1960s.
These were reputed to be rather dangerous in use.
3125) No real idea. A second view might help. It sort of looks like
there is a half cylinder behind the jaws to hold something. if
the teeth were staggered, I would think that it might be to
perforate something. It might be for something like breaking a
poker chip in half.
3126) Strange. It at first looks like a flash hider for a weapon,
except that the part which would slide over the barrel is
occupied by something else, which sort of looks like a wrench
for removing some part of the same weapon (the hex hole).
The color looks like Army battle gear of some sort.
But I *think* that is is some kind of flame torch. The fuel is
put into a part in the hex hole, which squirts the fuel into
the tube, where it is ignited. The holes surrounding the end
feed in more air to increase the burning rate near the point of
Perhaps part of a flame thrower.
Now to post this and then see what others have suggested.