Scans for this work are available from the Internet Archive (copy [1], [2]).
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- 2015-10-10 Started.
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Corrections
The following corrections have been applied to the text:
| Page | Source | Correction |
|---|---|---|
| [2] | [Not in source] | , |
| [17] | moter | motor |
| [24] | . | , |
| [26] | unbiassed | unbiased |
| [37] | , | . |