under the direction of an operator. She sits on a metal base with wheels that let her move around, turn in tight spaces and climb over small objects.

　　Mike McLoughlin is the main investigator for the Applied Physics Laboratory's Prosthetics

　　Programme.“The purpose of that programme is to develop prosthetic arms that have all the capability

　　of your natural arms, and you do all the complex motions that you can do with the natural arms—with the robot.”

　　It was a difficult job. Mr McLoughlin says the device had to have many small motors to have the ability to do what a human hand does. It

　　also needed to have human­like strength. The

　　thumb was especially difficult because it permits the hand to hold objects. And everything had to fit into a space about the size of a human hand.

　　The next problem, he says, was to figure out how to control the artificial hand.“So we had

　　to figure out how to make the connection between the brain and this arm.”

　　For search­and­rescue duties, Roho Sally will be operated by a human being using a wireless machine that is far from the robot. The operator will also wear special gloves and glasses.

　　The glasses permit the operator to see the robot's hands, even though they are far away.

　　Mr McLoughlin says this kind of robots could be used in what he calls “dull, dirty or dangerous” situations where fine human finger movements are required. He says the technology is

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