Improved 'Foriagraph' Unit

Description Of Item: Rectangular metal box 140 mm x 90 mm x 42 mm with black crackled enamel finish, enclosing two rotating discs each of ten apertures controlled from either side. Apertures 1 and 11 are open. Apertures 2 to 10 are filled with coloured glass (red, orange, green, blue and tricolour red, clear and blue) or white on black three character fixation tasks [412, 312, tin, sit (sit missing)]. Apertures 12 to 20 are filled with reduced apertures (3 mm and 1 mm) clear glass, frosted glass or larger font white on black three letter fixation tasks [512, 314, SIX, LIT (LIT missing)] or a white on black cross. White chart on reverse comprising a foriagraph muscle balance chart, the other side has slots for an interchangeable card, a near vision reading test featuring central aperture and around it four passages of text in named typefaces: Diamond, Pearl, Minion and Bourgeois. Also telephone directory entry, railway timetable London Victoria to Bromley South and musical staff (Card missing). Handle missing. Extendable measuring tape with finger ring 100 centimetres with millimetre graduations on top and dioptres underneath. Triple lens clips on upper surface to hold light red, dark red and green filters. (All missing).