General Information

Serial #

N/A

Part Number

1

Total Parts

1

AKA

N/A

Patents

N/A

General Description

synthetic upper & lower disks and rule/ metal spindle

Dimensions

Note: These reflect the general size for storage and are not necessarily representative of the object's true dimensions.

Length

24.4 cm

Width

23.0 cm

Height

N/A

Thickness

N/A

Weight

N/A

Diameter

N/A

Volume

N/A

Lexicon

Group

Mathematics

Category

Calculating devices

Sub-Category

N/A

Manufacturer

AKA

Emeloid

Country

United States of America

State/Province

New Jersey

City

Hillside

Context

Country

Canada

State/Province

Unknown

Period

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.

Function

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

Technical

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.

Area Notes

Unknown

Details

Markings

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'

Missing

appears complete

Finish

white upper and lower disks/ colourless, transparent rule

Decoration

N/A