Rule, plotting elevation

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TYPE D’OBJET
PHOTOGRAMMETRIC PLOTTER
DATE
1968–1970
NUMÉRO DE L’ARTEFACT
2004.1361.053
FABRICANT
Wild Heerbrugg
MODÈLE
1:20000 meters
EMPLACEMENT
Suisse

Plus d’information


Renseignements généraux

Nº de série
S/O
Nº de partie
53
Nombre total de parties
65
Ou
glass scale
Brevets
S/O
Description générale
clear glass

Dimensions

Remarque : Cette information reflète la taille générale pour l’entreposage et ne représente pas nécessairement les véritables dimensions de l’objet.

Longueur
22,5 cm
Largeur
2,1 cm
Hauteur
S/O
Épaisseur
S/O
Poids
S/O
Diamètre
S/O
Volume
S/O

Lexique

Groupe
Métrologie
Catégorie
Longueur
Sous-catégorie
S/O

Fabricant

Ou
Wild
Pays
Suisse
État/province
Inconnu
Ville
Inconnu

Contexte

Pays
Canada
État/province
Ontario
Période
presumably used c. 1970s- 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]
Fonction
Used for vertical component of plotting.
Technique
One of 15 glass scales from Group 1 (metric graduation) set supplied as standard accessory 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 1 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 meters. Rules are unnecessary when using [Kern] digital elevation counter.
Notes sur la région
Inconnu

Détails

Marques
"1: 20000" and scale etched into glass.
Manque
None.
Fini
Clear glass rule bears black markings.
Décoration
S/O

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Si vous souhaitez publier de l’information sur cet objet de collection, veuillez indiquer ce qui suit :

Wild Heerbrugg, Rule, plotting elevation, vers 1968–1970, Numéro de l'artefact 2004.1361, Ingenium - Musées des sciences et de l'innovation du Canada, http://collection.ingeniumcanada.org/fr/id/2004.1361.053/

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