Gi???res of honeycombed steel, attached to battleship anchor chain, form a successful "ball-and-chain" device, filmed?
GV The large steel balls and chains.
REAR V..Caterpillar tractor
LV Steel balls.
SV Tractor pulls chain and balls.
SV Balls crashing down small trees.
SCU..Steel ball and chains pass through undergrowth.
LV Cleared path.
SIDE V..Tractor pushes over large tree.
SV Tractor prises tree root completely out of ground.
GV The cleared area.
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Background: Gi???res of honeycombed steel, attached to battleship anchor chain, form a successful "ball-and-chain" device, filmed by Visnews crashing and tearing its way through the tangled Rhodesian bush, clearing 100,000 acres of rough land for the Kariba Dam project on the Zambesi River.
Like some monster form outer space, the device, linked to powerful caterpillar tractors is flattening the bush at 50 acres an hour.
The large b???ll hold down the chains to prevent them riding up the tilting trees. After clearance the vegetation is bulldozed into windrows and burned. But no single method however successful can do the whole job. Exceptionally large trees are tackled by a "stinger" (a device with a lift-and-push motion) - the stumps uprooted and tap roots severed.
Dam clearance is a costly job. The chain alone cost GBP6,000 and steel spheres GBP2,500 each. In time the bush will give way to harbours and fishing grounds.
Meanwhile the Dam is nearly completed in the Kariba Gorge. The 400-ft high wall was sealed in December, and with the flow of the Zambesi arrested, a great artificial lake, began to form behind the dam. This lake will eventually cover 2,000 square miles. When the hydro-electric scheme is ready, there will be enough power to make British Central Africa the most industrialised area in the continent.