rare PHOTOGRAH OF MOON LICK OBSERVATORY 1891 MAGIC LANTERN SLIDE

Captioned: Moon. Age 14 ds. 1 hr., July 19, 1891 Lick Observatory this Magic Lantern Slide from an 8" x 10" glass negative image of the moon taken by Edward S. Holden and William Wallace Campbell at the Lick Observatory...this astronomical observatory owned and operated by the University of California, at the forefront of astronomy since its founding in 1888 as the first year-round accessible mountain-top observatory...this scarce glass slide is part of a larger group of mostly Victorian astronomical images that we are offering...*Note some reflections in photos..Measures 4" x 3.25"...