Word: spectrographic
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...irregular intervals-increasing their brightness almost 100-fold. Astronomers have often speculated about these periodic changes, but until Dr. Kraft used the great 200-inch Palomar telescope to follow 20 dwarf novas through many bright and dim cycles, no one was sure what caused them. Using telescope and spectrograph, Dr. Kraft kept track of the novas' changing temperature, light and motion. After 30 months he was able to prove that at least seven of them are double stars. The two bodies whirl around each other every few hours, moving up to 165 miles per second, 24 times the speed...
...fangled detective gadgets with which Dr. Gonzales himself pioneered was the spectrograph. In 1942 the husband of a woman found strangled in Central Park had seven witnesses to swear that he had been at a dance at the time of her death. But spectrograph analysis of soil in his trouser cuffs broke his alibi and clinched the case that sent him to the electric chair...
Professors Donald J. Borror and Carl R. Reese borrowed an elaborate audio-spectrograph from the university's astronomical observatory (where it was used to study the scintillations of stars), and used it to analyze bird songs recorded in the fields and woods. It could hear notes much higher than the human limit (about 18,000 cycles a second), and it could catch and write down on its paper tape the fastest variations in the songs...
...first floor houses seven labs, a dark room, two cold rooms, and a special equipment room designed for the use of delicate instruments--the electron microscope and diffraction grating spectrograph. An isotope area is also equipped for work with radioactive material...
Among the instruments it carried to study the threshold of space were: 1) photon counters to detect X rays from the sun; 2) a spectrograph to record the sun's ultraviolet rays; 3) special photographic emulsions to trap cosmic rays, which are to be found at full power only above the atmosphere...