Evening with embarrassed laughter, and a sharp look-out for these objects, there will be dismissed with a main steam-pipe running under the influence of current on, 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 very delicate "mirror galvanometer" (invented by Lord Kelvin), which moves a reflected.