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Image Not Available for cloth light hood sample from Metcalf 16-inch astrograph
cloth light hood sample from Metcalf 16-inch astrograph
Harvard College Observatory
Date: after 1933
Object number: 2023-1-0012
Image Not Available for framed focus chart from 16-inch Metcalf astrograph building
framed focus chart from 16-inch Metcalf astrograph building
Harvard College Observatory
Date: circa 1935
Object number: 2016-1-0051
regulator clock
regulator clock
Seth Thomas Clock Company
Date: circa 1905
Accessories: winding key, timing weights, signaling sensor
Object number: 2016-1-0053