Dec., I92I.] U.S. BUREAU OF STANDARDS NOTES. 805 nitrite method of Holden and James. Each of these methods concentrated the erbium but not as rapidly as the nitrate fusion method. The best erbium fractions available contained considerable yttrium and probably small amounts of other rare earths. FRI
โฆ LIBER โฆ
Anti-friction ball bearings and their manufacture
โ Scribed by George F. Simonds
- Publisher
- Elsevier Science
- Year
- 1893
- Tongue
- English
- Weight
- 488 KB
- Volume
- 136
- Category
- Article
- ISSN
- 0016-0032
No coin nor oath required. For personal study only.
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