TRIAL CASES, FRAMES AND REFRACTOR HEADS
M. Wiseman & Company Ltd
Europe: United Kingdom, England, London
Mid-Late 20th c.
overall: 56 mm x 148 mm
Trial frame. Very dark blue, black and grey metal. Cylindrical browbar adjustable for PD by milled wheels (with tapering stems) at each end. Separately adjusted nasal rest with black plastic swivelling nose pad. Sprung white metal centre joints with metal sliding sides also of adjustable inclination via long milled control knobs. Imitation tortoiseshell mottled brown plastic end covers. Round eyes rotatable via milled wheels to sides (each with its own locking control, one of which is no longer original), each with triple lens clip to front and single downwards-pointing lens clip to back.
Gift of Mr Brian Mitchell, FBDO, 2004