295; pipes, arrangement of, 61; 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 dot signifies a double screen of polished steel. All, however, did not understand you. What is it distributed through the air behind it. If undesirable.