Abbe Apertometer in Original Case

Object Name: 
Abbe Apertometer in Original Case

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Object Name: 
Abbe Apertometer in Original Case
Place Made: 
Accession Number: 
2015.8.2
Dimensions: 
(a) Abbe Apertometer H: 3.1 cm, W: 11.5 cm, D: 7.5 cm; (b) Case H: 5.1 cm, W: 16.5 cm, D: 9.4 cm
Location: 
Not on Display
Date: 
1900-1925
Primary Description: 
Abbe Apertometer in Original Case. (a) Clear optical glass, black-enameled brass block. A wide black-enameled brass block carries a thick glass plate in the shape of a segment of a circle. The glass has a central target, a beveled totally reflecting underside, a polished periphery, a rotating index with white illumination spot and readout window, and scales of numerical aperture and angle. (b) Original hinged, black leather-covered box with blue velvet lining.
Provenance: 
Tesseract, Source
2015-12-15
Inscription: 
Abbe's / Apertometer
inscription
(a) on glass
ND = 1.62535
inscription
(a) on glass
CARL ZEISS / JENA
inscription
(b) on top of box in gold
APERTOMETER / NACH ABBE
inscription
(b) on top of box in gold
CARL ZEISS / JENA
inscription
(a) on glass
Tesseract: Early Scientific Instruments illustrated, Catalog 100 #95; BIB# 145588