Sprocket holes - perforations on both edges of 35mm film, which engage with the teeth of the film transport mechanism.
Uneven development.
1) Film is lighter or underdeveloped along one side . Not enough developer to cover the film in the tank.
2) Negatives have denser areas mirroring the shape of the sprocket holes.
[11] Edison claimed exclusive patent rights to his design of 35 mm motion picture film, with four sprocket holes per frame, forcing his only major filmmaking competitor, American Mutoscope & Biograph, to use a 68 mm film that used friction feed, ...
The most popular film size; 35mm wide with punched sprocket holes and made for both still and motion picture cameras. In 1913, Oscar Barnack, of 'Leitz ' first used it in a still camera when he created the 'Leica' prototype using movie film stock.
Third, the EOS Magazine source apparently claims that the EOS 10/10s camera used a sort of hybrid mechanism whereby sprocket holes were counted with an IR counter but it still relied on a mechanical sprocket drive.
Some cameras use a beam of IR light to see 35mm sprocket holes go by to control film advance. This is brilliant for normal film which can't see IR, but also means you can't use IR film in these cameras. Most Canon film cameras do this, sorry.
The covering has a sticky coating where the film sprocket holes are. This avoids the problem of sliding film in a sheath. I have heard others complain that the coating causes other problems, but I have not run into any such problems.
sprocket holes (film) - holes punched in a film to assist in moving the film through a camera or projector - particularly apparent on 35mm film.
standard lens - See normal lens
stereo and stereophotography ...
 See also: Film, Camera, Sprocket, Light, Exposure
  
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