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Chapter 20 THE ESTIMATION OF DISTANCES AND HINTS ON FIELD OBSERVING.

On measuring the Distance travelled by Wheeled Carriages.

When no instrument for this purpose is obtainable, the best plan we know of is that adopted by the late Dr. Burchell, the eminent South African traveller, and after him by Captain Cornwallis Harris, the explorer and naturalist, in the more distant parts of the same country; and this is, t

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