Horne & Thornthwaite single lens (3D) stereo camera c.1849 (with possible later lens).
Shown closed for travel, film/plate holder in slide-in carrier was carried, fitted internally in camera body. Camera to tripod slide mount (for stereo work folded on camera top).
Also shown ready for use, camera fitted to opened tripod slide mount, film plate holder in carrier – slide was inserted into narrow doors at rear-sides of camera body.