She worked on the 240-GHz radiometer for the Earth Orbiting System Microwave Limb Sounder. Instruments included an antenna dish, cameras, spectrometer, infrared sounder, magnetometers (MISCHA) and plasma probes. They often combine call point functionality with sounder and strobe functions for ease of installation. This can be determined using satellite data from the Atmospheric Infrared Sounder. Sound Transit plans to add additional Sounder South Line stations at Tillicum and DuPont. The Mars Reconnaissance Orbiter's Mars Climate Sounder can similarly derive atmospheric profiles. He found that sufficient current would pass through the device to operate a telegraph sounder. The ship was fitted with a powerful echo sounder. One of its instruments, the Mars climate sounder is specialized for climate observation work. The fathometer, or depth sounder, was developed commercially during the 1920s. A battery back-up sounder and tracking device called Trackstar were available as options. Using a portable echo sounder, the team took measurements of the volume of the glacier. The first echo sounder for the commercial fishing fleet came on the market in 1950. The bell sounder would be used well into the 1990s. Near-contemporaries described how "his temper was less explosive than formerly and his judgement sounder".