Antique Test Equipment
It is not at all clear how one would measure Quality Factor without a Q-meter.
These are remarkable devices. They include a thermocouple and measure the amount
of energy dissapated in the device under test. The less energy dissapated in the
device, the higher the Q. For further information, see the following references:
The Boonton Radio Corporation Page
About Q (Quality Factor)
The Boonton 260A Q-Meter
In the 50' through maybe the 70's, General Radio Corporation of West Concord,
Massachusetts, made a wide variety of test equipment. One of their most successful
products was the impedance bridge. These devices are still useful today.
The General Radio Impedance Bridge Page
If you get any obscure manuals that you think should be shared (and aren't too long), let me
borrow it for a while so I can scan it and post it on the web site.