General Information

Serial #

N/A

Part Number

9

Total Parts

19

AKA

projector component

Patents

N/A

General Description

COMPONENTS ARE METAL; SOME SYNTHETIC HOSES, CORDS & FITTINGS/ GLASS OPTICS

Dimensions

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

Length

60.0 cm

Width

26.0 cm

Height

23.0 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

KELSH

Country

United States of America

State/Province

Maryland

City

Baltimore

Context

Country

Canada

State/Province

Ontario

Period

KELSH PLOTTERS WERE FIRST USED IN CANADA IN MID-1950s & WERE USED INTO 1970s

Canada

KELSH PLOTTERS REPLACED MULTIPLEX PLOTTERS AS THE PRINCIPLE PLOTTING UNITS OF BOTH MILITARY & DEPT. OF ENERGY, MINES & RESOURCES (EMR) IN CANADA IN EARLY 1960s (REF 1, P.2).

Function

TO PROJECT STEREOSCOPIC MODEL IN ORDER TO INTERPRET, MEASURE & PLOT DATA GATHERED FROM AERIAL SURVEY PHOTOGRAPHS.

Technical

KELSH PLOTTER IS A PROJECTION INSTRUMENT USING FULL SIZE DIAPOSITIVES (SAME SIZE AS AERIAL CAMERA WHICH TOOK PHOTOS). IT CONFINES ILLUMINATION TO AN AREA APPROX. 1 SQ INCH ON EACH DIAPOSITIVE-ONLY THE PART OF THE MODEL APPEARING ON THE TRACING TABLE PLATEN IS ILLUMINATED. THIS RESULTS IN EXCELLENT RESOLUTION OF STEREOSCOPIC IMAGE (REF 2, P.175; REF 1, P.47).

Area Notes

Unknown

Details

Markings

‘DIST.FREE' & ‘.130 GLASS' incised on rods. ‘LENS NO. 1866' incised on plate on frame. ‘1' incised twice on central section.

Missing

N/A

Finish

PRINCIPALLY GREY, BLACK OR DRAB-GREEN IN COLOUR

Decoration

N/A