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How Romans lifted blocks of stone.
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Previously:
Ancient Roman aqueduct - photo
Ancient Roman city aerial view - photos
Ancient Roman faucet - photo
Ancient Roman phallic ring - photo
Ancient Roman timekeeping - GIF
Roman farmer's calendar - photo
Roman lead plumbing - photo
Why Roman concrete was so durable - photo
The 3 piece insert is now known as a 'Lewis', a term that is also used to define a Mason's sons.
How is the third insert placed in the stone? If the insert is rotated the hole must be longer than the three together.
The only one of those I've seen up close, was in a museum, the 3rd one didn't play a part of the lifting it just kept the other two separated in their cutsQuote:
Originally Posted by Ralphxyz
To expand on what Frank S said, the center section wasn't made like what is shown in the video. It was a few thinner pieces cut square to drop in the hole to secure the tapered parts.
Thank you Frank, that makes sense!