Rule, plotting elevation
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2004.1367.006
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- OBJECT TYPE
- PHOTOGRAMMETRIC PLOTTER
- DATE
- 1968–1970
- ARTIFACT NUMBER
- 2004.1367.006
- MANUFACTURER
- Wild Heerbrugg
- MODEL
- 1:7500 feet
- LOCATION
- Switzerland
More Information
General Information
- Serial #
- N/A
- Part Number
- 6
- Total Parts
- 16
- AKA
- glass scale
- Patents
- N/A
- General Description
- clear glass
Dimensions
Note: These reflect the general size for storage and are not necessarily representative of the object's true dimensions.
- Length
- 22.5 cm
- Width
- 2.1 cm
- Height
- N/A
- Thickness
- N/A
- Weight
- N/A
- Diameter
- N/A
- Volume
- N/A
Lexicon
- Group
- Metrology
- Category
- Length
- Sub-Category
- N/A
Manufacturer
- AKA
- Wild
- Country
- Switzerland
- State/Province
- Unknown
- City
- Unknown
Context
- Country
- Canada
- State/Province
- Ontario
- Period
- presumably c. late 1960s- early 1990s.
- Canada
-
Accessory 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
-
To establish the plotting scale to be used when mapping. - Technical
-
One of 15 glass scales from Group 2 (imperial graduation) set available as an accessory for use with A8 plotter. Scales are inserted in a holder directly attached to the z column and projected under strong magnification onto a ground glass screen in front of the operator. [Ref.3, p.17] The rule [glass scale] must correspond to the model scale [instrument scale] in order to enable the operator to read the elevations. Wild provided a set of 4 tables, one for each of the 4 different groups of rules [glass scales] available, to facilitate the selection of the appropriate rule and [ratio] gear for a given plotting scale. [Ref. 2, p.32] Group 2 set consists of scales 1:3000; 1:3750; 1:4000; 1:5000; 1:6000; 1:7500; 1:8000; 1:10 000; 1:12 000; 1:12 500; 1:13 333 1/3; 1:15 000; 1:16 666 2/3; 1:20 000; 1:25 000 feet. Group 1 set consists of identical scales, in metric values. Rules are unnecessary when using [Kern] digital elevation counter. - Area Notes
-
Unknown
Details
- Markings
- "1: 7500/ feet" and scale etched into glass. "7500 FT" printed by hand on one long side edge of rule.
- Missing
- None.
- Finish
- Clear glass rule bears black markings.
- Decoration
- N/A
CITE THIS OBJECT
If you choose to share our information about this collection object, please cite:
Wild Heerbrugg, Rule, plotting elevation, circa 1968–1970, Artifact no. 2004.1367, Ingenium – Canada’s Museums of Science and Innovation, http://collection.ingeniumcanada.org/en/item/2004.1367.006/
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