National Geographic : 1922 Oct
00 TRACTION ENGINE AND BOAT CROSSING A RIVER In the race through the jungle against the coming equatorial downpours, much time was lost at river fords. Many ofthem were not strong enough to sustain a heavy weight, and either gave way altogether or embedded the wheels of the traction engineintheir earthwork and timber. Haste was imperative, for the African rainy season lasts for weeks, sweeps away bridges and fords, and turns lower levels into enormous tracts oflake land. Note the tarpaulin covers used in an unsuccessful effort to prevent the boats from warping under the equatorial sun (see text, page 345).