A row of narrower sprocket holes that were always punched served to feed the tape, typically with a wheel with radial teeth called a sprocket wheel.
From the en.wikipedia.org
The film, with a single row of perforations engaged by an electrically powered sprocket wheel, was drawn continuously beneath a magnifying lens.
From the en.wikipedia.org
During continuous contact printing, the raw stock and the negative are placed next to one another around the sprocket wheel of the printer.
From the en.wikipedia.org
In an ordinary derailleur transmission, found on any 10-speed bike made today, the mechanism nudges the chain off one sprocket wheel onto the next when riders push a lever.
From the newscientist.com
Fixed and single-speed bikes have just one sprocket on the rear wheel.
From the thisisbristol.co.uk
Because the ride is so flat, I opted to use my fixed-gear bike with a 42-tooth chainring and a 14-tooth sprocket on the rear wheel.
From the sacbee.com
It is driven by a toothed wheel called a sprocket.
From the en.wikipedia.org
The cast track driving wheel with removable sprocket ring was located in front, and the track idler with a crank lever tightener was located in the rear part of the vehicle.
From the en.wikipedia.org
These are calculated by multiplying the wheel diameter in inches by the number of teeth on the front chain-wheel and dividing by the teeth on the rear sprocket.