General Information

Serial #

N/A

Part Number

1

Total Parts

8

AKA

N/A

Patents

N/A

General Description

METAL/ CASE: WOOD WITH METAL HARDWARE, LEATHER HANDLE, & FELT PADDING

Dimensions

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

Length

25.5 cm

Width

10.0 cm

Height

7.5 cm

Thickness

N/A

Weight

N/A

Diameter

N/A

Volume

N/A

Lexicon

Group

Exploration and Survey

Category

Photogrammetry

Sub-Category

N/A

Manufacturer

AKA

Unknown

Country

Unknown

State/Province

Unknown

City

Unknown

Context

Country

Canada

State/Province

Unknown

Period

PROBABLY 1940'S

Canada

DEVELOPED BY THE DOMINION FOREST SERVICE OF THE DEPT. OF MINES & RESOURCES, IN OTTAWA. FURTHER DEVELOPMENT GAVE RISE TO THE SEELYSCOPE BUT NONE OF THE DEVICES WERE WIDELY USED OUTSIDE CANADA OR CONTINUED IN USE.

Function

USED TO 'SUPERIMPOSE' AN AERIAL PHOTO ON TO A MAP IN SUCH A MANNER THAT BOTH HAVE THE SAME HORIZONTAL SCALE. DETAILS FROM THE PHOTO CAN BE TRACED ON TO THE MAP QUICKLY & EASILY.

Technical

ALLOWS A PHOTO TO APPEAR SUPERIMPOSED & PROPERLY ADJUSTED ON A MAP, PERMITTING DIRECT TRANSFER & PREVENTINGERRORS BY MAKING POSSIBLE A SIMULTANEOUS & NATURAL OBSERVATION OF THE PHOTO & THE ACTUAL MAP SHEET. THE SIMPLICITY OF THE OPERATION RESULTS IN AN ACCELERATION IN THE RATE OF PLOTTING.

Area Notes

Unknown

Details

Markings

SCRATCHED ON: 'D-3'/ HANDWRITTEN ON CASE: 'D-3'

Missing

2 BARS; LENS BRACKET & LENSES

Finish

BLACK WRINKLE FINISH/ CASE: PAINTED GLOSS BLACK; BLACK HANDLE; GREEN FELT

Decoration

N/A