General Information

Serial #

4501

Part Number

1

Total Parts

1

AKA

N/A

Patents

N/A

General Description

METAL, GLASS & SYNTHETIC CONSTRUCTION; FABRIC COVERED ELECTRICAL CORD.

Dimensions

Note: These reflect the general size for storage and are not necessarily representative of the object's true dimensions.

Length

54.5 cm

Width

33.0 cm

Height

57.5 cm

Thickness

N/A

Weight

N/A

Diameter

N/A

Volume

N/A

Lexicon

Group

Medical Technology

Category

Medical equipment

Sub-Category

N/A

Manufacturer

AKA

Hardy

Country

United States of America

State/Province

Illinois

City

Chicago

Context

Country

Canada

State/Province

Ontario

Period

THIS TYPE USED IN EARLY 1900S.

Canada

USED IN CANADA BY DR. BENJAMIN WASERMAN, A GENERAL PRACTIONER IN THE OTTAWA AREA.

Function

USED TO MEASURE THE CURVATURE OF THE EYE'S CORNEA.

Technical

IMPROVED VERSION OF DEVICE INVENTED BY HELMHOLTZ IN C. 1855, TO DIAGNOSE AND MEASURE ASTIGMATISM. EARLIER INSTRUMENT WAS ACCURATE, BUT NECESSITATED 15-20 READINGS PER PATIENT PLUS CALCULATIONS, AND WAS THEREFORE NOT WIDELY USED. IN 1894 THE AMA ADVOCATED USE OF OPHTHALMOMETER FOR OBJECTIVE EYE EXAMINATIONS.

Area Notes

Unknown

Details

Markings

"C.I. OPHTHALMOMETER./ PAT/ AUG. 22,99/ CHICAGO, ILL. U.S.A." cast in raised print on frame. "4501" incised on instrument top. Various scales, adjustments, etc. marked on instrument.

Missing

ELECTRICAL SWITCH COVER MISSING. SMALL AREA OF LOSS IN CENTRE.

Finish

GOLD PAINTED FLORAL, LEAF & CIRCULAR DESIGNS, AND STRIPING ON BASE & POSTS; FLAT BLACK ENAMEL BASE.

Decoration

N/A