I have a question about an old instrument that I picked up years ago. =
The markings are Sprengnehter Instrument Co, St Louis, Mo and an =
engraved number 4218. It is in a square metal box (about 4"x 8"x 6" and =
weights about 6/7 lbs). It seems to have a liquid in it and it does have =
a bubble level on top of it. It has 4 wires coming out of an old =
shielded/sheathed cable. Two of them, when the box is tilted, put out a =
spike voltage (they are red/black and measure 11k ohms) The other two =
wires (green/white don't put out a voltage and measure about 6 ohms and =
neither set of wires have a resistance relationship to the other two).I =
assumed it was a strong motion indicator. Playing around with it, =
yesterday, I hooked it up in place of my lehman horizontal sensor and it =
does pass the "walkup test" generally producing one or two sine wave =
signals from the red/black wires being fed into the existing setup. Now, =
a few questions. Does anyone know anything about this instrument, and =
what are the green/white wires for (an input voltage)? Thank you in =
advance. Ed.=20








I have a question about an old instrument that I picked up years ago. =
The=20
markings are Sprengnehter Instrument Co, St Louis, Mo and an engraved =
number=20
4218. It is in a square metal box (about 4"x 8"x 6" and weights about =
6/7 lbs).=20
It seems to have a liquid in it and it does have a bubble level on top =
of it. It=20
has 4 wires coming out of an old shielded/sheathed cable. Two of them, =
when the=20
box is tilted, put out a spike voltage (they are red/black and measure =
11k ohms)=20
The other two wires (green/white don't put out a voltage and measure =
about 6=20
ohms and neither set of wires have a resistance relationship to the =
other two).I=20
assumed it was a strong motion indicator. Playing around with it, =
yesterday, I=20
hooked it up in place of my lehman horizontal sensor and it does pass =
the=20
"walkup test" generally producing one or two sine wave signals from the=20
red/black wires being fed into the existing setup. Now, a few questions. =
Does=20
anyone know anything about this instrument, and what are the green/white =
wires=20
for (an input voltage)? Thank you in advance. Ed.=20