Diaphragmatic Shutter
One of Two Diaphragmatic shutters (C.J. Wollaston's patent), by Eidsforth & Mudford, c. 1887.
One of Two Diaphragmatic shutters (C.J. Wollaston's patent), by Eidsforth & Mudford, c. 1887.
One of Two Diaphragmatic shutters (C.J. Wollaston's patent), by Eidsforth & Mudford, c. 1887.