Visual Tracking Magnifier (VTM); optical device used to help dyslexia sufferers by blocking textual 'pattern glare' 1999
Wooden handle, brass disc with 6 circular apertures. A colour rotator according to attached label. Associated numbers:- A204328, B1053. (Adrian Whicher 2017-04-28) Optical device; colour rotator
Rotating optical device with lenses, some missing from their holders. Associated numbers:- A191084, B1466, SCI 31/69, Dept 1, 4c-1. (AW) Rotating optical device with lenses
Optical device. Metal surround with eyepiece one end, ground glass screen opposite end. 165109 on attached label (no A). (AW) Unidentified optical device part