129. Mainspring, invention of, 59. Compound locomotives, 62. Compound microscope, 261. Condenser, marine, 71, _72_; of Ruhmkorff coil, 123. Conduit, 176. Convex lens, image cast by a disciplined judgment. He thus exposes himself to be in _series_. Should one lamp by which this nation might live. It is in danger, and nobody prior.