General Information

Serial #

N/A

Part Number

1

Total Parts

9

AKA

N/A

Patents

N/A

General Description

METAL WITH GLASS MIRROR/ CASE: WOOD WITH METAL HARDWARE & LINED WITH CLOTH

Dimensions

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

Length

29.0 cm

Width

11.0 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

SPARTAN

Country

Canada

State/Province

Ontario

City

Ottawa

Context

Country

Canada

State/Province

Unknown

Period

PROBABLY LATE 1940'S & 1950'S

Canada

DEVELOPED BY THE DOMINION FOREST SERVICE AND MANUFACTURED BY A CANADIAN FIRM.

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 ONTO THE MAP QUICKLY AND EASILY.

Technical

CREATION OF A SIMPLE, PORTABLE AND RELATIVELY INEXPENSIVE INSTRUMENT FOR PRACTICALAPPLICATIONS IN THE FOREST INDUSTRY TO REPLACE THE HIGH PRECISION, RESEARCH INSTRUMENTS WHICH WERE BEING PRODUCED IN OTHER COUNTRIES AT THE TIME.

Area Notes

Unknown

Details

Markings

PLAQUE ON BOX LID: 'SPARTAN AIR SERVICES LIMITED/ 473 WELLINGTON ST./ OTTAWA, CANADA/ SEELYSCOPE/ CAN. PAT. NO. 392,431/ U.S. PAT. NO. 2,229,424'/ STAMPED IN PLAQUE: '140'/ DECAL READS: 'DEPARTMENT OF FORESTRY/ SERIAL NO. 00185'.

Missing

1 MIRROR; 1 HANGING MIRROR BRACKET; 2 LIGHTING ASSEMBLIES; 1 SCREW DRIVER; GRAPHITE; LENS BRACKET & LENSES

Finish

BLACK CRINKLE FINISH/ CASE: STAINED & VARNISHED, GREEN LINING

Decoration

N/A