Photographed with a small camera lens of 1 inch aperture and 5 inches focal length. The three bright stars in the centre of the picture form the belt of Orion. Just below, in the sword handle, is an irregular white patch about one-eighth of an inch in diameter. This is a small-scale image of the great nebula in Orion, shown on a larger scale in Fig. 2.] DIRECTOR OF THE MOUNT WILSON OBSERVATORY OF THE CARNEGIE INSTITUTION OF WASHINGTON…
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