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concave mirror positional for critical illumination
Great condition precision instrument
Source: 1919 Tyco's Industrial Equipment Catalog (page 74)
and 45 degree angled mirror
Antique Harris-Style Gold-Leaf Electroscope monocular concave mirror positional for criticalEarly 20th century Harris Style gold leaf electroscope. A fine single leaf electroscope used to demonstrate electrostatic charge. Mahogany housing with lacquered brass components, Bakelite insulator, and gold leaf indicator. A pristine, custom build. Unsigned, English made. First invented by Abraham Bennet in 1786, this Harris style electroscope is more sensitive and advanced in comparison to the older pith ball style electroscope. The device works
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