The Hollow Earth
The Hollow Earth is a free 123-page science ebook by F. T. Ives, published Jul 2022. It is free to download in PDF, ePub, and Kindle formats — no payment required. Rated 5.0/5 by 1 reader.
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A Crank that revolves only half way will not always accomplish much of a change, and in many cases would only aggravate the situation. Were it not for Cranks nearly all mechanical appliances would be motionless.
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