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This for the free and non-navigable balloon, though for the airship, carrying means of combustion, and in military work liable to ignition by explosives, the gas helium seems likely to replace hydrogen, being non-combustible. In spite of the development of the dirigible airship, there remains work for the free, spherical type of balloon in the scientific field.
The essential things that must be done to protect the water powers for the people are few and simple. First, the granting of water powers forever, either on non-navigable or navigable streams, must absolutely stop.
There is a further discussion as to what is the true source of the Thames, and which streams may properly be regarded as its head-waters: the Churn, especially since the digging of the canal, having a larger flow than the stream from Thames head; but whichever is chosen, the non-navigable portion starts at the same point, and is the third of the divisions into which the valley ranges itself when it is considered in its length, as a highway from the west to the east of England.
If the difficulties are greater, then the danger that the water powers may pass out of the people's hands on the lower navigable parts of the streams is greater than on the upper non-navigable parts, and it may be harder, but in no way less necessary, to prevent it.
It is at least equally important as a recognition that the public controls its own property and has a right to share in the benefits arising from its development. There are other ways in which public control of water power must be exercised, but these two are the most important. Water power on non-navigable streams usually results from dropping a little water a long way.
It exercises control over non-navigable and source streams only through its ownership of the lands through which they pass, as the public domain and National Forests. It is just as essential for the public welfare that the people should retain and exercise control of water-power monopoly on navigable as on non-navigable streams.
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