A device used for viewing stereographs. Stereographs are cards with two photographs beside each other, which, when looked at through the stereograph, give the user 3D views of the subject.
Stereoscopes were first made in the 1840s and became very popular when they found favour with Queen Victoria at the Great Exhibition in 1851. Stereoscopes were used for entertainment, education and tourism/travel and were the predecessor to television and the internet.
handling collection number: HC170
why not get your hands on these... Bob's Set Toy HC169, Newspaper, Bay of Plenty Times 1872 HC147