21.   Mission officials at the Jet Propulsion Laboratory in Pasadena, Calif., said the spacecraft and its scientific instruments were performing normally.

22.   Nomad is powered by a gasoline-driven generator that supplies electricity for its computers, communications, scientific instruments, high-resolution digital camera and propulsion.

23.   Of more concern, officials said, is the health of one of the three primary scientific instruments, the Mars radiation environment experiment, called Marie.

24.   On Monday, Surveyor is expected to point its camera and scientific instruments toward the Martian surface for the first time.

25.   Reis is buying the property from the Perkin-Elmer Corp. of Ridgefield, a manufacturer of scientific instruments.

26.   Researchers are looking into the use of balloons to carry scientific instruments over the surface of other planets.

27.   She especially likes firms that supply the scientific instruments used in biotech drug discovery, such as Waters Corp. of Milford.

28.   Scientific instruments normally last a few years before they become obsolete, but the Hale is a striking exception to that rule.

29.   Still, it was especially frustrating for scientists like Dr. Daniel McCleese, who built one of the two principal scientific instruments on the Climate Orbiter.