Bob and Steve measured the resistance of the suspension wire today:
OD = 0.0036" = 0.091 mm
Length = 46" = 1168.4 mm
Resistance = 33.3 Ohms
resistivity = R * pi * (OD/2)^2
----------------- = 1.85e-7 Ohm-meters
Length
This was a batch of California Fine Wire from 2001 (same as used at LHO and LLO).
By comparison the standard tabulated resistivity for steels is (http://hypertextbook.com/facts/2006/UmranUgur.shtml):
resistivity (Ohm-meter x 10^-7)
------------- ----------------
304 Stainless 7.2
316 Stainless 7.4
Cast Steel 1.6
This is all to see whether or not the 60 Hz fields produce forces on the suspension wires via coupling with the Earth's DC field.
TBD |