SPARK PLUG n.
In internal-combustion engines with electric ignition, a plug, screwed into the cylinder head, having through it an insulated wire which is connected with the induction coil or magneto circuit on the outside, and forms, with another terminal on the base of the plug, a spark gap inside the cylinder.
STOP n.
, etc.; also, any of the consonants so formed. H. Sweet. Stop bead (Arch.), the molding screwed to the inner side of a window frame, on the face of the pulley stile, completing the groove in which the inner sash is to slide. -- Stop motion (Mach.), an automatic device for arresting the motion of a machine, as when a c…