How were large slabs of stones cut for use in constructing ancient forts, without using electric tools ?
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Use iron/steel drill bits to drill a series of holes into the stone along the proposed cut line. Insert metal wedges into the drill holes and hammer them down evenly. This will crack and then pry the stone apart.
He made a mistake with the original cut line, as there was an unseen fault line in the stone. But he repeats the process (albeit saving some effort by using an electric drill) on a good part of the stone and makes a pretty clean cut using the iron wedges.
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