silent speed

silent speed

[′sī·lənt ′spēd]
(engineering)
The speed at which silent motion pictures are fed through a projector, equal to 16 frames per second (sound-film speed is 24 frames per second).
References in periodicals archive ?
Freakishly fast but eerily quiet, you find your head coping with an entirely new sensation of silent speed.
WHAT happened when the Mirror's motormouth Siobhan McNally tried silent speed dating?
The tests were shot at sound speed (twenty-four frames per second), but Warhol wanted them projected at silent speed (sixteen flames per second), so they take longer to see than they did to make: They retard time.