The Holmes-model stereoscope, first invented in 1861, consists of two prismatic lenses and a stand to hold the image card, known as a “stereoview.” This stereoscope recreates natural 3D vision by presenting two photographs of the same object, taken from slightly different angles but focused on the same point. Each picture is focused by a separate lens, with a partition between the images ensuring each eye sees only the image meant for it, preventing distraction from the opposing image. This reference item can be used only at the Grants Pass branch to view its accompanying collection of over 300 historical photos.
|
