Here is the manual for the later version (1491) that came in a number of variations. The largest listed go to 11H. Usually you would use a transformer to mimic a larger inductor or capacitor for the reference measurement applications of these devices.
Here is a catalog with the 1490 series listed: https://www.ietlabs.com/pdf/GR_Catalog/GenRad_CatO-1956.pdf
I have a 1481 10H inductor which is larger than any listed in the 1956 catalog and seems to be the largest they made. Its useful for calibrating my precision bridges.
Here is a catalog with the 1490 series listed: https://www.ietlabs.com/pdf/GR_Catalog/GenRad_CatO-1956.pdf
I have a 1481 10H inductor which is larger than any listed in the 1956 catalog and seems to be the largest they made. Its useful for calibrating my precision bridges.
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