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 |