Refractometer
notes: label: Description
content: This refractometer was designed to estimate the total refractive error and amount of astigmatis. It was devised by Henry Lawrence De Zeng (1866-1929), a graduate of Hobart College who invented several ophthalmological and otolaryngological instruments, and who established the De Zeng Standard Co. in 1906. It was made by the Cataract Optical Co., a firm in Buffalo, N.Y. that was in business by 1898, and that advertised the De Zeng refractometer as “a scientific apparatus of the highest order of optical and mechanical art” that was “Used and endorsed by Many of the Leading Eye Specialists, Ophthalmic Hospitals, and by the United States Army."
label: Description
content: Ref: Henry L. De Zeng, Jr., “Refractometer,” U.S. Patent 550,747 (Dec. 3, 1895).
label: Description
content: Cataract Optical Co. ad for “De Zeng’s Refractometer” in <i>The Optical Journal</i> 4 (1898): 50.
label: Description
content: Arthur Brigham Norton, <i>Ophthalmic Diseases and Therapeutics</i> (Philadelphia, 1902), pp. 67-68.
label: Location
content: Currently not on view
place: label: place made
content: United States: New York, Buffalo
setName: label: See more items in
content: Medicine and Science: Physical Sciences
creditLine: label: Credit Line
content: Dr. J. Staiman
dataSource: label: Data Source
content: National Museum of American History
identifier: label: ID Number
content: MG.M-07031
label: accession number
content: 216897
label: catalog number
content: M-07031
objectType: label: Object Name
content: refractometer
physicalDescription: label: Measurements
content: overall: 14 7/8 in x 8 5/8 in x 12 in; 37.7825 cm x 21.90826 cm x 30.48 cm