meter
Object NameDuboscq Colorimeter with Extra Parts
Manufacturer
Bausch & Lomb
Made FromGlass, Brass, Nickel-Plating, Steel, Enamel, Aluminum
Date1870-1941
Place MadeUnited States, NY, Rochester
TechniqueCast, assembled
SizeOverall H: 32.3 cm, W: 20.6 cm, D: 13.8 cm
Accession Number2016.8.21
Credit LineGift of Richard A. Paselk
Curatorial Area(s)
Not On View
Physical DescriptionDuboscq Colorimeter with Extra Parts. The prism housing/telescope mount is cast brass, attached with nickel-plated brass knurled screws. The sample cups (55 mm deep) are glass in nickel-plated brass shields (total height 72 mm). Each cup is held in a bracket on a focusing rail with a 60 x1 mm scale read against a 0-10 vernier scale. Small mirrors mounted at 45° allow viewing the scales from the telescope eye-position. The hexagonal glass prisms are 55 mm long with an optical finish on all surfaces. The optical shield is formed of steel sheet. The mirror illuminator may be flipped over to give a flat white surface instead. Colorimeter accompanied by the following extra parts: one beam combining prism and housing, two cell holder brackets, one dipping prism.Provenance
Source
Richard Paselk
- 2016-08-01
Former Collection
Humboldt State University
This instrument was used in the Biology Department's physiology laboratory at Humboldt.
This instrument was used in the Biology Department's physiology laboratory at Humboldt.
1865-1880
