Renseignements généraux

Nº de série

S/O

Nº de partie

1

Nombre total de parties

1

Ou

S/O

Brevets

S/O

Description générale

synthetic upper & lower disks and rule/ metal spindle

Dimensions

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

Longueur

24,4 cm

Largeur

23,0 cm

Hauteur

S/O

Épaisseur

S/O

Poids

S/O

Diamètre

S/O

Volume

S/O

Lexique

Groupe

Mathématiques

Catégorie

Dispositifs à calculer

Sous-catégorie

S/O

Fabricant

Ou

Emeloid

Pays

United States of America

État/province

New Jersey

Ville

Hillside

Contexte

Pays

Canada

État/province

Inconnu

Période

after 1944 +

Canada

An American made manual calculating device used by a Canadian electronics engineer in the course of his work. The previous owner of this calculating device was Mr. Bob Bennett, who was born in 1920 in Fort William, Ontario. He attended McGill University, graduating in 1942 with a degree in electrical engineering. During WWII he was in the Signal Corps, stationed in Ottawa from 1942-1946, and was involved in radio design and development. In 1946 Mr. Bennett joined the Canadian Pacific Railway but rejoined the Army in 1947 and remained until 1960 working in radio telecommunication research and development. From 1960 to 1979 Mr. Bennett worked in the Public Service in electronics and telecommunication engineering, largely with D&D.

Fonction

A calculating device used to determine impedance of a transmission line.

Technique

An example of a specialized slide rule which relates the series components of impedance at any position along an open-wire or coaxial transmission line to the impedance at any other point, the standing wave amplitude ratio [SWR], and the attenuation.

Notes sur la région

Inconnu

Détails

Marques

black lettering on back reads 'Refer to "Transmission Line Calculator"/ by P.H. Smith, Bell Telephone Laboratories/ Jan. 1939 and Jan. 1944 Electronics/ THE EMELOID CO., INC./ HILLSIDE 5, N.J.' with instructions for use and examples/ black lettering an d markings on front read 'WAVELENGTHS TOWARD GENERATOR' and 'WAVELENGTHS TOWARD LOAD' on lower disk and 'ANGLE OF REFLECTION COEFFICIENT IN DEGREES', 'POSITIVE REACTANCE COMPONENT' and 'NEGATIVE REACTANCE COMPONENT' on upper disk/ red lettering and markings on rule reads 'VOLTAGE OR CURRENT. LIMITS RATIO' and 'ATTENUATION/ DISSIPATION REFLECTION'

Manque

appears complete

Fini

white upper and lower disks/ colourless, transparent rule

Décoration

S/O