General Information

Serial #

N/A

Part Number

1

Total Parts

1

AKA

N/A

Patents

N/A

General Description

PLASTIC CALCULATOR WITH METAL PIVOT/ PLASTIC RADIUM PROTECTION CHARTS/ LEATHER? CASE WITH METAL ZIPPER

Dimensions

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

Length

17.7 cm

Width

17.5 cm

Height

1.2 cm

Thickness

N/A

Weight

N/A

Diameter

N/A

Volume

N/A

Lexicon

Group

Mathematics

Category

Calculating devices

Sub-Category

N/A

Manufacturer

AKA

ELDORADO

Country

Canada

State/Province

Ontario

City

Ottawa

Context

Country

Canada

State/Province

Ontario

Period

Unknown

Canada

CANADIAN MADE CALCULATOR USED AT LARGEST RESEARCH INSTITUTION IN CANADA DURING PERIOD OF ITS MOST RAPID GROWTH, GREATEST PRODUCTIVITY & DURING WHICH IT DEVELOPED WORLD RENOWNED REPUTATION. H.E. JOHNS (B. 1915) WAS CANADIAN PHYSICIST WHO DEVOTED CAREER TO APPLICATION OF PHYSICS TO MEDICINE,ESPECIALLY DEVELOPMENT AT U. OF SASKATCHEWAN OF COBALT THERAPY UNITS FOR TREATMENT OF CANCER, USED WORLDWIDE.

Function

DEVICE USED TO CALCULATE DECAY OF RADIUM & DOSAGE OF RADIATION TO BE USED IN TREATMENT OF DISEASE.

Technical

Unknown

Area Notes

Unknown

Details

Markings

BLACK LETTERING ON SLIDE RULE READING "RADIUM/ DOSAGE CALCULATOR/ BASE ON.5 MM. PT. FILTRATION/ DESIGNED BY/ H.E. JOHNS, PH.D. & E.W. SPENCER, M.D., D.M.R./ SASKATHEWAN WEATHER COMMISSION" & "ELDORADO MINING & REFINING (1944) LTD./ P.O. BOX 379, OTAWA, CANADA"/ BLACK MARKINGS & NUMBERING ON SCALES

Missing

COMPLETE

Finish

WHITE & COLOURLESS TRANSPARENT CALCULATOR WITH PLATED METAL/ WHITE CHARTS/ BROWN CASE WITH GOLD COLOURED ZIPPER

Decoration

N/A