Word: spectrographed
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...spectrum gives astronomers clues about how hot the body is, whether it is advancing or retreating, whether it is spinning, whether it is dense or thin, what it is made of. Unfortunately, for technical reasons, not all the light of a celestial image can be crammed into the spectrograph...
...Francis William Aston invented the mass-spectrograph, which measures the mass of atoms by recording their paths in a magnetic field. The principle is that the degree of curvature of an atom's path under magnetic attraction depends on its mass. This instrument was of enormous value in the study of isotopes, which are atoms of the same element having different weights...
Most astronomers say that the galaxies, unimaginably huge, stupendously scattered collections of stars, are running away from Earth and from each other at a rate of many thousands of miles per second. They back up their assertion by catching light from a galaxy in a spectrograph, measuring how far its spectral lines have shifted, in a given period, toward the red or violet end of the spectrum. If the lines redden, that implies the galaxy is receding from the observer, stretching out its light-waves, just as a train whistle lengthens its sound-waves, becomes flatter as it moves into...
...England, which counts alpha particles (nuclei of helium atoms) as they explode from radium at a speed of 12,000 mi. per sec., and ten microseconds apart. (A microsecond is one-millionth of a second.) Dr. Kenneth T. Bainbridge of Bartol Laboratories, Philadelphia, again described his two-ton mass-spectrograph which is sensitive to one-trillionth of a trillionth of an ounce (TIME, Feb. 22), which delicately indicated that the average atomic weight of the isotopes of tellurium is (new observation) 127.47 instead of 127.5. Dr. Bainbridge is proud that his machine cost him only $2,000 to build. President...
...have two or more isotopes; i. e., appear in different forms, which, though outwardly similar, have different atomic construction, different weights. Though the average atomic weights of all the elements are known, the precise weights of the different isotopes of many elements are not known. Dr. Bainbridge expects his spectrograph to remedy that...