To add to the uncertainties of navigation, the inhabitants along the eastern bank of the stream frequently dig new canals for irrigation purposes, which both reduces the water of the river and tends to make it shift its channel.
Mining is also subject to the risks of ordinary business enterprises, and to additional risks and uncertainties peculiar to itself.
These uncertainties raise a greater one of much significance, viz.
They are also partly caused by the large uncertainties of the corrections, especially those of the mercury thermometers under the peculiar conditions of the experiment.
The other uncertainties of the method remain.
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