to the passage below and then answer the question afterwards in the same language as the passage: Passage: In 1849, Rutherfurd abandoned his study of law to dedicate his leisure to science, particularly astronomy. He performed pioneering work in spectral analysis, and experimented with celestial photography. He invented instruments for his studies, including the micrometer for measuring photographs, a machine for producing improved ruled diffraction gratings, and the first telescope designed specifically for astrophotography.Using his instrumentation, Rutherfurd produced a quality collection of photographs of the Sun, Moon, and planets, as well as star clusters and stars down to the fifth magnitude. In 1862, he began making spectroscopic studies using his new diffraction grating. He noticed distinct classes of spectral grating of stars, which Angelo Secchi expanded in October 1867 upon a list of four stellar classes. He performed pioneering work in spectral analysis, and experimented with celestial photography. He invented instruments for his studies, including the micrometer for measuring photographs
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