General Radio 1604-B ?

For googling, the words Genrad or Quadtech maybe useful but probably later useage than yours

-- Diverse Devices, Southampton, England electronic hints and repair briefs , schematics/manuals list on

Since no one else has suggested; join the 'GenRad' Yahoo group (mailing list is snipped-for-privacy@yahoogroups.com); members have provided manuals and schematics for most everything General Radio and the discussion is of a high caliber.

Michael

"Henry Kolesnik" wrote in news:7Hjvl.14832 $ snipped-for-privacy@flpi146.ffdc.sbc.com:

I used somewhat similar bridges in the 60's and 70's to measure capacitance.

In brief you have device for measuring capacitors and inductors.

You put a known device on the left, an unknown device on the right and adjust for minimum signal on the scope. The bridge is 'balanced' when you do this. You combine the known value and the setting made to balance the bridge and you now know the value of the unknown.

See