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Schiotz tonometer

https://mhc.andornot.com/en/permalink/artifact10699
Dates
1905
1930
circa 1905-1930
Collection
Dr. J. A. Stewart Collection
Category
Diagnostic & Treatment Artifacts
Vision
Classification
Ophthalmology
Vision
Vision Tests
Accession Number
004011001 a-c
Description
A Schiotz tonometer in case consisting of the tonometer itself (a) which consists of a T shaped top with graduated numbers going from 0 to 15 on the beam; at the base of the T there is a needle which moves back and forth along the measurements on the T depending on the pressure exerted on a concaveā€¦
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Accession Number
004011001 a-c
Collection
Dr. J. A. Stewart Collection
Category
Diagnostic & Treatment Artifacts
Vision
Classification
Ophthalmology
Vision
Vision Tests
MeSH Heading
Tonometry -- instrumentation
Intraocular Pressure -- instrumentation
Vision
Vision Tests
Vision Tests -- instrumentation
Ophthalmology
Ophthalmology -- instrumentation
Description
A Schiotz tonometer in case consisting of the tonometer itself (a) which consists of a T shaped top with graduated numbers going from 0 to 15 on the beam; at the base of the T there is a needle which moves back and forth along the measurements on the T depending on the pressure exerted on a concave dome at the base; there is also a handle extending out from each side of the device; there is also a small metal calibration device which is in the shape of a short cylinder with a domed top; this device is used to calibrate the needle to zero; the case (c) is made of out and is coated in think black leather and leatherette and is lined with green velvet and beige fabric inside; there is a compartment in the case for another piece, but it is not present.
Number Of Parts
3
Part Names
a - tonometer - Size: Length 11.9 cm x Width 4.4 cm x Depth 2.3 cm
b - calibration device - Size: Depth 0.8 cm x Diam. 1.0 cm
c - case - Size: Length 13.4 cm x Width 6.0 cm x Depth 3.3 cm
Provenance
Owned by Dr. J. A. Stewart, Queen's University Faculty of Medicine Class of 1923; Dr. Stewart gave it to Dr. Roseborough.
Maker
F. A. Hardy Co
Site Made (City)
Chicago or New York
Site Made (State)
Illinois or New York
Site Made (Country)
United States of America
Dates
1905
1930
circa 1905-1930
Date Remarks
The device was invented in 1905.
Material
metal: silver
wood: brown
leather/leatherette: black
fabric: beige; green
Inscriptions
"[illeg.] RADLE - SCHIOTZ - TONOMETER" on the box lid; "Made By // F. A. HARDY & CO. // Chicago - New York" printed on the fabric inside the box; "F.A. HARDY & CO. // 298" engraved on the tonometer on the back
Permanent Location
Storage Room 0010
0010-E4-7
Condition Remarks
The tonometer is like new; the leather on the case is extremely damaged.
Reference Types
Internet
Reference Comments
Internet: "National Library of Medicine"; Internet: "Professional Information Page for Veterinarians"
Research Facts
Used to measure intraocular pressure.
Tonometer also known as an Ophthalmodynamometer; used to measure the pressure on the blood vessels in the retinal vessels of the eye (intraocular pressure).
Images
Less detail