In 1839 the Stanhope lens was invented, making novelty souvenirs like this little pig possible, with its interior aerial view of the 1893 World's... | By The Eden Collective | Facebook
Sold at auction An Ivory Stanhope Lens and a Compass Microscope Auction Number 2555M Lot Number 13 | Skinner Auctioneers
Stanhope lens in ivory mounting | Science Museum Group Collection