Hotmail
Messenger
My MSN
MSN Directory
Additional Reference Materials
ThesaurusBilingual Dictionaries
Web Centre
Facts & Figures
Other Resources
Primary ResourcesTimes Archive
Literature Guides
Foreign Language Help
Project Starters
Tea Break
Columns
Top 10 Lists
This Day in History
Multimedia
Support
Encarta ProductsEncarta Answers
Encarta Worldwide
Help
Crookes Tube |
||||||
 |
||||||
 |
||||||
| William Crookes constructed this forerunner of the modern television picture tube in the 1870s to investigate the properties of cathode rays. When the tube is evacuated and a high voltage applied, one end of the tube glows, because of cathode rays (now known to be electrons) striking the glass. The modern television picture tube, also known as a CRT (cathode ray tube) is a direct descendant of the Crookes tube. The major differences are that a CRT uses a heated cathode to increase the number of electrons, while the Crookes tube does not, and the CRT has extra electrodes to focus and deflect the beam as it travels towards the screen. | ||||||
|
||||||
| © Microsoft Corporation. All Rights Reserved. | ||||||
|
||||||
|
||||||
| Appears in these articles | ||||||
|
||||||
| Crookes Tube; Cathode Ray; Television; Cathode Ray Tube | ||||||
|
||||||
|
||||||
|
||||||||||||||||||||||||||||||||||||||
| |
||||||||||||||||||||||||||||||||||||||
© 2008 Microsoft
  |