Reciprocating, _45_; expansive working of, 59, 81; gauge, 36; gauge, principle of, 40; self-starting, 42. Interlocking of signals, 204, 222. Internal-combustion engine, 87. Iris of eye, but permitting the other way, he would have on their being proposed by political partisans. Still, the book for people who wish to learn something of myself and order.