Hand and sucker

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“The ‘sucker’ consists of a circular piece of thick leather with a string attached to its middle. Being soaked thoroughly in water, it is firmly pressed upon a flat stone to drive out all air from between the leather and the stone. Unless the stone is too heavy, it may be lifted by the string.” — Avery, 1895


Elroy M. Avery School Physics (New York: Sheldon and Company, 1895) 196


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