Interpupillary distance (PD) measuring device

Catalogue Number: 909
Interpupillary distance (PD) measuring device
Category: Equipment
Sub-Category: PD ruler, pupillometer
Time Period: 1900 to 1939
Description Of Item: Instrument to measure interpupillary distance comprising 2 flat plano lenses (centres marked with a cross) mounted on square section metal rod. One lens fixed at one end of rod, the other slides and its position marks the PD on a calibrated mm scale. Mounted in turned black handle. Nickel alloy, glass, brass. L: 24.0 cm x D: 5.0 cm
How Acquired: Donated by J Bissell
Condition: Very good
Location: Archive office. East wall shelves unit 3. Drawer 1

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