Colorful magic lantern slide advertising Babe Ruth's underwear a white space underneath where a location could be advertised where the product might be purchased. Magic lantern slides were widely used in the early 1900s paired with special projectors which gave people an early look at color images of people locations and places of interest. We have featured a number of advertising-related slides in this auction all seldom seen. This example is in excellent condition produced by the Select Advertising Service Company of Cincinnati with only some minor blemishes evident.