Large diode, formerly used in a teaching laboratory for high-voltage work, c.1950-c.1970 Large diode circa 1950-circa 1970
Laboratory glassware, glass tubing with gauze filter clamped together with triangular metal clamps and screws, maker, place and date of manufacture unknown. One piece of the glass tubing is stamped with a trade mark in blue ink but the details are unclear. Glass tubing with gauze filter clamped together with triangular metal clamps and screws