Historical information

From attached information on display: This engine was designed to explore the nature and magnitude of mechanical defects in ruling engines. It was used to cut simple rulings for the calibration of microscope fields of view.

Physical description

First micro-ruling engine made (1934), by Stone, with flat rectangular iron base and wheel mechanism. A scriber made of a gramophone needle is in place over the glass slide on a ruling table. A second holder for a diamond lies beside the instrument.