"STONEHENGE MAGIC LANTERN SLIDE" THIS IS 3 1/4 X 4 IN IT IS GLASS THIS IS PART OF A VERY BIG COLLECTION , MARKED KANSAS STATE COLLEGE OF AGRICULTURE AND APPLIED SCIENCE, MANHATTAN KANSAS THAT NAME WAS USED FROM 1927 TO 1955, SO THE AGE OF THESE ARE SOME WHERE IN BETWEEN. (original eBay listing info and photo)