Renseignements généraux

Nº de série

S/O

Nº de partie

1

Nombre total de parties

1

Ou

S/O

Brevets

S/O

Description générale

metal battery casing-handle/ synthetic focusing head / glass lamp bulb/ paper part

Dimensions

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

Longueur

21,4 cm

Largeur

4,0 cm

Hauteur

S/O

Épaisseur

4,0 cm

Poids

S/O

Diamètre

S/O

Volume

S/O

Lexique

Groupe

Photographie

Catégorie

Images photographiques

Sous-catégorie

S/O

Fabricant

Ou

Inconnu

Pays

Inconnu

État/province

Inconnu

Ville

Inconnu

Contexte

Pays

Canada

État/province

Nouvelle-Écosse

Période

circa 1974 to 1991

Canada

This slide pointer was purchased ca. 1974 in Halifax, NS, at the Atlantic Photo Supply Ltd. Photography store. The donor used this optical presentation aid when teaching classes at St. Mary's University. He also made use of it when conducting tours of the university's Burke-Gaffney Observatory. The device was used from 1974 to 1991.

Fonction

This optical device was used during a lecture/presentation to point out specific areas on a projection screen when showing slides or using transparencies.

Technique

Before the advent of laser pointer technology, lecturer's used a stick to point out something on a screen or blackboard during a presentation. This device is a type sample of the earliest optical pointers made. Composed of a small incandescent bulb and a lens, the pointer would project an arrow when switched on. It features a focusing head to focus the arrow at various distances. When compared to modern-day laser, technology, this pointer did not perform that well because the beam could not be collimated as well as that of a laser. Nonetheless, the creation of such a device was a major step forward compared to the use of a pointing stick.

Notes sur la région

Inconnu

Détails

Marques

none

Manque

appears complete except for batteries

Fini

Inconnu

Décoration

S/O