Publisher's Synopsis
Excerpt from Canadian Mining Journal, Vol. 36: July-December 1915
The amount of oil used in these tests was very small. The purpose being merely to indicate the most promis ing of the oils available. And at the same time to study their selective action. Here again it is seen that of the three. Or four oils giving the best results. Pine-tar oil excels in selective action: whence this oil alone was used in the following tests.
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