Residing within the 1930 observatory was a 5-inch refracting telescope built in 1893 by Alvan Clark & Sons, the preeminent American telescope manufacturer of the late 19th century.
The October 22, 1930 edition of the Horae Scholasticae includes this information about the Observatory:
The telescope and attendant apparati are in every way perfectly equipped. The lens is a five-inch refracting glass made by Alvan Clark & Sons of Cambridge, Massachusetts. It was formerly the property of Mr. Isham. It is mounted on a six-foot cylinder which has four eye-pieces attached to its lower end. The light gathering power of the aperture as compared with the human eye is approximately 625 times as great. The lowest power eye-piece magnifies 48 times, the highest 300 times.
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Persons: Isham, Edward Pierpont
Form Year: 1921
This item is part of: The Drury Albums
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"Observatory: Telescope." St. Paul's School. Ohrstrom Library Digital Archives. Web. 28 Mar. 2017.