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Filtering by: Creator Curtis, Heber Doust, 1872-1942 Series Series 6: Glass Negatives Topic Refracting telescopes

$36-inch refractor, the "Great Lick Refractor": view with the old Mills spectrograph in its case$

$36-inch refractor, the "Great Lick Refractor": view showing the old Mills spectrograph, with its temperature control$

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