General Information

Serial #

N/A

Part Number

64

Total Parts

65

AKA

N/A

Patents

N/A

General Description

glass; paper

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

25.5 cm

Height

N/A

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

Switzerland

State/Province

Unknown

City

Unknown

Context

Country

Canada

State/Province

Ontario

Period

plotter used c. 1960s- early 1990s.

Canada

Accessory/part for plotter used in Canada's national mapping program c. 1960s-early 1990s, and is an example 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], this machine was the most sophisticated plotter available before digital technology. This machine was converted c. 1995-96 to digitize the motions (X,Y & Z) with the addition of encoders and a control pad which interfaced to a computer. The Kern encoders and control module were installed by Terra Surveys of Ottawa when they rented this machine for the MOM project, completing the large scale mapping of Riyadh, Saudi Arabia. The A8 was on loan to Terra for the duration of the project's digital compilation stage. [Ref. 1]

Function

Used with image carrier on photogrammetric plotter.

Technical

Wild A8 plotter introduced in 1952 (with A7 Autograph): these two machines were most widely used plotters in last half of 20th c.. Analogue plotters like A8 are still in use, but are frequently converted to digital operation by addition of digital shift encoders. This permits semi-automation of mapping process from negatives or prints, but is not equivilant to digital technology, which uses images from digital cameras and which is current standard [c. 2000 +] . This plate (and it's mate .065] could not be conclusively identified. It appears to be plain glass, as is used in cover plates for image carriers [see . 5 & .6]; however the markings on the tissue paper wrapper specify the plotter's serial no. and includes "PL No. 531", suggesting this might be a correction plate for use with images produced by a specific aerial camera.

Area Notes

Unknown

Details

Markings

No markings evident on plate. "A8-2465" stamped in black ink on paper wrapper; PL No 531" printed by hand in green pencil on wrapper seal.

Missing

None.

Finish

Clear glass plate wrapped in white tissue paper.

Decoration

N/A