Word: spectras
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...method the spectra of various metals were obtained by burning the metal in the flame of a Bunser lamp placed before the slit of a spectroscope which had one prism. As a consequence the lines of the spectra were crowded together and confused. The modern method of observing spectra is by taking photographs in the spectroscope and composing the result with a photograph of the Sun's spectrum...
...sodium lines. It is the first one of the kind that has ever been produced. America has done more in the last fifty years to bring photography to perfection than any other country, although much has been accomplished by recent scientific investigation in England and France. The old spectra of stars were mere dots, but now Professor Pickering has been able to take photographic spectra of them as large as the old spectra...
...several special lines of study with benefit to a large class of people. Much valuable work has been done by the members of the Astronomical Observatory. Director Edward C. Pickering has issued a short but extremely important document, viz., "The First Annual Report of the Photographic Study of Stellar Spectra conducted at the Harvard College Observatory." Seth Carlo Chandler has written "The Almucator," a volume of 222 pages. In the Medical School the writings have been unusually voluminous. Nearly every one in the faculty has furnished something, and a few have exceeded their quota. There were no books...
...other places by funds administered at Harvard. During the past year the Observatory has lost the services of Prof. Rogers, for a long series of year an indefatigable worker with the meridian circle. As a memorial to the late Prof. Henry Draper, the study of the photography of stellar spectra undertaken by him is now, through the liberality of Mrs. Draper, being prosecuted on a scale appropriate to the advance in this department of science, and forms an important extension of the work of the Observatory. The meridian photometer has been kept in active service throughout the year, and leaves...