This is Orson Welles speaking from London. The Black Museum. Here in the grim stone structure on the Thames which houses Scotland Yard is a warehouse of homicide. Where everyday objects, objects like a sugar bowl, an ashtray, a portable radio, all are touched by murder. There's a hammer. A hammer, that's a familiar object. Everybody's used one at some time to drive a tack, a poor nail, or loosen a window sash, or what have you. Nearly everybody has at one time or another tak…