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The Evolution of a Spark Unit

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The precision of routine spectrographic analysis is dependent upon the rigid control of many factors. Some of these are:

1. Homogeneous samples.

2. Reproducible sparking surface on samples.

3. Reproducible sparking conditions (the power source).

4. Homogeneous emulsions on the photographic plates or film.

5. Stable and reproducible densitometry.

6. The choice of good matched spectral line pairs.

7. The use of the correct emulsion calibration curve.

8. The use of the correct analytical curve.

Document Type: Research Article

DOI: http://dx.doi.org/10.1366/000370252774652622

Affiliations: Chemical Laboratory, South Works, United States Steel Company

Publication date: February 1, 1952

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