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Webster's Dictionary (1865)

Lew'is or Lew'is-son, n.

noun

(lū'is), n. 1. An iron clamp dovetailed into a large stone to lift it by.

Sense 2. A kind of shears used in cropping woolen cloth. Ogilvie.

A labeled diagram of a lifting device called a Lewis or Lewisson, shown set into a stone block and suspended from chains.
Lewis, or Lewisson.