Spencer Company Eye Test Chart on Board antique magic lantern slides When I spotted this

When I spotted this

one would just need to wind a string around the wooden peg at top

Tales of Adventure

I assume the intent was for this to be made into a rug or mat

and a little foxing here and there

Spencer Company Eye Test Chart on Board antique magic lantern slides When I spotted thisI believe this eye test chart dates to the mid to late 1940s; I have found some references to the Spencer Company of Mount Vernon that produced it from around then, including in Popular Photography magazine advertising photography equipment. I have found no matches for it out there anywhere though, so am not sure how much traction it gained as among optometrists though with its terrific mix of text and patterns and color it seems like it would have