On February 16, 1882 the day Onoko was scheduled to be launched, about five thousand people came to watch the launching despite the rough weather conditions. With all the preparations completed Smith gave the launch signal at 3 p.m.. The ropes that were tied to Onoko were cut at each end enabling her to slide into the water. During the next few months Onoko was outfitted and rigged. Although most of the vessel's machinery had been fitted before her launching, her masts at least were installed later. This was done by the Messrs, Upson, Walton & Company.
