Letchworth Optical Instrument Co
Europe: United Kingdom, England, Hertfordshire, Letchworth
overall: 254 x 207 mm
Instruction leaflet for a model of projection focimeter. Printed in black, white on eight pages, stapled and holepunched. Includes note on fitting the bulb correctly on back cover. Illustrated with eight black and white photographs of the product including, on the front cover, its use with spectacles mounted by a female operator measuring the power of a spherical lens and, inside, the parts of the instrument identified, the instrument display screen illuminated and the lens marking device.
Arthur Bennett Archive