Objects
The London Portable Subjective Unit
TEST CHARTS
test chart
London Optical Company Ltd
Europe: United Kingdom, England, London
1961
metal; plastic
overall: 270 mm x 250 mm x 350 mm
2025.182
TEST CHARTS
test chart
London Optical Company Ltd
Europe: United Kingdom, England, London
1961
metal; plastic
overall: 270 mm x 250 mm x 350 mm
Collapsible test chart holder and light box. Connector for 240V candle bulb. Two clasp fasteners and steel-reinforced leather carrying handle. Metal-mounted bichromatic chart and Verhoeff Circles chart.
2025.182
Gift of Miss Mary Norman, 2024