DEVIL n.
An expletive of surprise, vexation, or emphasis, or, ironically, of negation. [Low] The devil a puritan that he is, . . . but a timepleaser. Shak. The things, we know, are neither rich nor rare, But wonder how the devil they got there. Pope.
EYEPIECE n.
Collimate. -- Negative, or Huyghenian, eyepiece, an eyepiece consisting of two plano-convex lenses with their curved surfaces turned toward the object glass, and separated from each other by about half the sum of their focal distances, the image viewed by the eye being formed between the two lenses. it was devised by…