| All returns accepted | ReturnsNotAccepted |
|---|---|
| Country/Region of Manufacture | United States |
Check the listing for details. Absolute Determination of the Ampere, Using Improved Coils 1939. Condition: Used. Listed at 30.00 USD. Harvey Curtis, Roger Curtis, and Charles Critchfield, in Research Paper RP1200 for the National Bureau of Standards, make a precise determination of the ampere. No. 357. 32pp.