Renseignements généraux

Nº de série

S/O

Nº de partie

4

Nombre total de parties

9

Ou

light box viewer

Brevets

S/O

Description générale

metal (probably brass); glass

Dimensions

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

Longueur

S/O

Largeur

S/O

Hauteur

5,3 cm

Épaisseur

S/O

Poids

S/O

Diamètre

2,5 cm

Volume

S/O

Lexique

Groupe

Exploration et levé

Catégorie

Photogrammétrie

Sous-catégorie

S/O

Fabricant

Ou

Wild

Pays

Inconnu

État/province

Inconnu

Ville

Inconnu

Contexte

Pays

Canada

État/province

Ontario

Période

c. late 1960s- 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.

Fonction

Used to view fiducial marks on picture carriers and correctly align images for use of plotter.

Technique

Magnifier or eyepiece for 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. Four magnifiers allow operator to independently view and match markings on images with picture carrier. (Ref. 3) The magnifiers can be adjusted within their body tube, and come with an eyepiece cover.

Notes sur la région

Inconnu

Détails

Marques

None evident.

Manque

Appears complete.

Fini

Dark metal (brass?) casing; clear glass lens.

Décoration

S/O