Discharge Through Gases

Synopsis

Shows the discharge patterns which occur when pressure is progressively reduced, and explains the theory of discharge through rarefied gases. Animated diagrams explain stage by stage how light is produced by the displacement of electrons after collision with gas atoms in the tube. Changes in potential along the tube cause the familiar alternate bands of Crookes dark space, negative glow, Faraday dark space and positive column. Ends with photographs of some modern applications of the theory

Language

English

Country

Great Britain

Medium

Film; Film. 16mm. sd. b&w. 12 min.

Technical information

Black-and-white / Sound

Year of production

1955

Availability

OUT OF DISTRIBUTION

Uses

Introductory courses.*

Subjects

Physics

Keywords

atoms; electrons; gases

Credits

Director

M Crosfield

Producer

F Hoare

Distribution Formats

Type

Film

Format

16mm

Production Company

Name

Merton Park Studios

Sponsor

Name

Mullard Ltd

Distributor

Name

National Education Video Library

Contact

John Lovell

Email

tryfannevl@aol.com

Phone

01286 676001 or 07768 105467

Fax

01286 676001

Address

Arfon House
Bontnewydd
Caernarvon
Gwynned
LL54 7UN

Notes

Formerly the National Audio Visual (Aids) Library. No longer holds 16mm material. Retains the negatives and copyright to the EFVA material, but have no viewing copies. Video only. (1/97) Alternative address might be Arfon House, Bontnewydd, Caernarvon, Gwynned LL54 7UN Telephone/Fax 01286 676001