The B voltage gives the plate a positive charge to attract electrons from the filament.
Many tubes also have small structures, known as grids, between the filament and the plate.
When you connect the A battery, the filament of the tube is heated to release negatively charged electrons.
Electrons travel through the partial vacuum inside the tube, flowing from the filament to the positively charged plate.
The Crookes tube is in principle an Edison lamp with the filament broken.
To complete a circuit, the current must flow through this wire or filament.
Here the vegetative filament puts out two protuberances, which become shut off from the body of the filament by partitions.
A filament is that which is threadlike; as, the filament of silk, or flax.
A filament of flame darted down the dark skies one moonless night and those who saw it believed, at first, that it was a meteor.
Close to the filament is a graphite disk which serves as one of the electrodes.
filament fil·a·ment (fĭl'ə-mənt)
A fibril, fine fiber, or threadlike structure.