Orthoplan interference microscope, trinocular, with interference contrast optical equipment designed by Smith, made by Leitz, Wetzlar, German, 1961-1970.
An interference microscope splits beams of light and passes them through a specimen to allow us to see and measure details that would not be detectable using a single beam of light. Images can be photographed through the microscope for study at a later date. The equipment was designed by Smith of England but manufactured in Germany by E Leitz. The design of the microscope meant that a rapid change of magnification could be achieved without readjusting the components.