The reels of film were old and battered and no one knew what was on them.

They were from before World War I and had been shuttled around from basements to barns to garages and had just been dropped off at the Library. There were about 10 of them and they were rusted. Some were misshapen. The nitrate film stock had crumbled to bits on some; other strips were stuck together.

The librarians peeled them apart and gently looked them over, frame by frame.

And there, on one film, was a black star painted onto a pedestal in the center of the screen. The action was of a magician and a robot battling it out in slapstick fashion. It took a bit, but then the gasp of realization: They were looking at “Gugusse and the Automaton,” a long-lost film by the iconic French filmmaker George Méliès at his Star Film company.

The 45-second film, made around 1897, was the first appearance on film of what might be called a robot, which had endeared it to generations of science fiction fans, even if they knew it only by reputation. It had not been seen by anyone in likely more than a century. The find, made last September but now being announced publicly, is a small but important addition to the legacy of world cinema and one of its founders.