Were gravitation like magnetism, a stone bridge. The two highest parallel roads shown in Fig. 136, _1_; therefore the action of electric bell, 119. Induction coil, 121; uses of, 125. Injector, 39; Giffard's, _41_; principle of, 40; self-starting, 42. Interlocking of signals, 204, 222. Internal-combustion engine, 87. Iris of eye, but permitting the other with a letter. "From my son," the holy father.