photomicrographic attachment. Fitted to the objective of the microscope using the microscope lens for taking the picture after it ahd been correctly focused on the ground glass screen. For exposing the negative, the sliding black cover was withdrawn and after the exposure, pushed back. Mostly likely used with paper negative material. John Browning, c.1890 Photomicrographic attachment circa 1890
Camera attachment 55mm screw flange for camera lens fitting, holding microscope slide. Latter adjustable for distance by screw; spring-loaded. Camera attachment for photomicrographic