Skip header and navigation

2 records – page 1 of 1.

Dates
1900
1930
1900-1930
Collection
University Health Network - Academy of Medicine Collection
Category
Diagnostic & Treatment Artifacts
Vision
Classification
Optometry
Vision
Vision Tests
Accession Number
1987.1.2 a-c
Description
Optometer (a) with a wooden handle, metal eyepiece, sliding visual test chart mounted on a calibrated wooden rod; accompanied by a pink card (b), printed and calibrated, two pieces that interlock at the temple; a blank form (c) for ordering corrective lenses based on tests and measurements made usi…
  1 image  
Accession Number
1987.1.2 a-c
Collection
University Health Network - Academy of Medicine Collection
Category
Diagnostic & Treatment Artifacts
Vision
Classification
Optometry
Vision
Vision Tests
MeSH Heading
Vision Tests
Optometry
Vision
Description
Optometer (a) with a wooden handle, metal eyepiece, sliding visual test chart mounted on a calibrated wooden rod; accompanied by a pink card (b), printed and calibrated, two pieces that interlock at the temple; a blank form (c) for ordering corrective lenses based on tests and measurements made using (a) and (b).
Number Of Parts
3
Part Names
a - optometer - Size: Length 33.5 cm
b - eye measure - Size: Length 15.0 cm
c - order form - Size: Length 28.0 cm x Width 21.6 cm
Provenance
Acquired from the Academy of Medicine; source: Dr. T. Porter; used by his grandfather, James Mason, in Listowel.
Site Made (Country)
Canada / USA
Dates
1900
1930
1900-1930
Material
paper; pink; yellow
wood: brown
metal: silver
Permanent Location
Storage Room 0010
0010-E4-10
Condition Remarks
Worn.
Copy Type
Original
Research Facts
A device for measuring ocular refraction. Instrument for measuring the refractive state of the eye. There are two main types of optometers: subjective and objective. Subjective optometers rely upon the subject's judgment of sharpness or blurredness of a test object while objective ones contain an optical system which determines the vergence of light reflected from the subject's retina.
It was illegal for optometrists to use optometers after 1919, but they were frequently given away by mail order companies with the spectacle order forms.
Images
Less detail

dental crown stretcher

https://mhc.andornot.com/en/permalink/artifact13300
Dates
1930
1960
circa 1930-1960
Collection
Dr. Ralph and Mrs. Olga Crawford Canadian Dental Collection
Category
Diagnostic & Treatment Artifacts
Classification
Dental
Accession Number
010020178
Description
Silver metal dental crown stretcher; two handles, curved inward, end with flat, circular discs that lie flat against each other at top of instrument; five pairs of knobs bolted over edges of discs; knobs all have different shapes but are generally rounded; pairs open and close when handles are move…
  2 images  
Accession Number
010020178
Collection
Dr. Ralph and Mrs. Olga Crawford Canadian Dental Collection
Category
Diagnostic & Treatment Artifacts
Classification
Dental
MeSH Heading
Dental Instruments
Dentistry, Operative -- instrumentation
Description
Silver metal dental crown stretcher; two handles, curved inward, end with flat, circular discs that lie flat against each other at top of instrument; five pairs of knobs bolted over edges of discs; knobs all have different shapes but are generally rounded; pairs open and close when handles are moved inward and outward; screw between handles can widen or shorten the amount of space in between pairs of knobs; yellow adhesive around one handle.
Number Of Parts
1
Provenance
Transfer from the Dental Canada Fund; previously housed in the Dentistry Canada Museum (Ottawa)
Maker
Densco
Site Made (City)
Denver
Site Made (State)
Colorado
Site Made (Country)
United States of America
Dates
1930
1960
circa 1930-1960
Date Remarks
Based on similar items
Material
metal: silver
rubber: yellow
Inscriptions
Engraved on front: "DENSCO // DENVER"
Permanent Location
Storage Room 0010
0010-B
Dimension Notes
Length 16.9 cm x Width 7.1 cm x Depth 0.7 cm
Condition Remarks
Metal very slightly tarnished; yellow tape around one handle
Copy Type
Original
Reference Types
Other
JPG
Reference Comments
010020176; 010020177
CD #10
Research Facts
Dr Ralph and Mrs Olga Crawford donated their extensive Canadian dental collection to the DCF to create the museum in 1997; further donations were received while Dr Crawford was Curator Emeritus at the Dental Canada Museum until its closure in 2008; this item was donated by Dr. Dennis Smith from Winnipeg, Manitoba, who described the item as a crown stretcher
Images
Less detail