General Information

Serial #

N/A

Part Number

1

Total Parts

9

AKA

centring device

Patents

N/A

General Description

wood, metal, glass & synthetic components and fittings.

Dimensions

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

Length

47.0 cm

Width

43.0 cm

Height

25.0 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

Wild

Country

Unknown

State/Province

Unknown

City

Unknown

Context

Country

Canada

State/Province

Ontario

Period

c. late1960s- early 1990s.

Canada

Accessory used with Wild A8 Autograph [2004.1361], used in Canada's national mapping program c. 1960s-early 1990s, an example of one of the last analogue plotting devices used by the Topographic Service of Canada. With the exception of the Wild A10 [few of which were used in Canada], the A8 was the most sophisticated plotter available before digital technology.

Function

Used to centre images on film or glass to film plate holder, prior to use with photogrammetric plotter.

Technical

Centring device used with A8 model (also A7, and possibly other models] plotter. The two holes in the light box top match the two holes on the camera body where the plate holder sits. When using the plotter for aerotriangulation or plotting, the operator would set the plate carrier on this device and use it to centre the film positives [this is called "inner orientation"]. [Ref.2] Fiducial marks for all widely used types of aerial cameras are located on the picture carriers: because preparation of the images is done on the light box [as opposed to the plotter itself], an assistant can prepare images in advance, for rapid fitting to the plotter. This device would have been provided with the A8 as a standard accessory. (Ref. 3)

Area Notes

Unknown

Details

Markings

No markings on light box. Off-white sticker applied to top panel, below on/off switch marked "SAVE ENERGY- ECONOMISONS L'ENERGIE" at regular, repeating intervals on border. "SERVICE LAMP CO./ CANADA/ 40W/ 125-130 VOLTS" printed on lamp bulb.

Missing

Appears complete.

Finish

Varnished light-brown wood base & sides; black enamel-painted metal frame surrounds central frosted glass panel; metal hinges & handle; black synthetic off/off knob; black synthetic covering on electrical cord. Interior: white glass lamp bulb shielded by silver-colour reflector; exterior of reflector painted dull green.

Decoration

N/A