stepping relay การใช้

• The stepping relay was programmed by slide switches in the front of the two relay racks which housed the equipment.
• The stepping relay was " programmed " by slide switches in the front of the two relay racks which housed the equipment.
• The news feeds were triggered by a microswitch which was attached to a Western Union clock and tripped by the minute hand of the clock . and then reset the stepping relay.
• The heart of the automation was an 8 x 24 telephone stepping relay which controlled two reel-to-reel tape decks, one twelve inch Ampex machine which provided the main program audio and a second RCA seven inch machine which provided " fill " music.