| Field |
| Watching Television |
| Went Obsolete |
| 1970's |
| Made Obsolete By |
| Internal electronic control circuitry |
| Knowledge Assumed |
| None |
| When useful |
| Not useful any more as the controls for doing this are not there |
Television receivers prior to the 1970's had 2 rotary controls. One for the horizontal hold and one for the vertical hold. These controls were turned until the full picture stayed on the screen without moving. These controls no longer exist on any TV made today.
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