Regularly and accurately spaced holes punched throughout the length of 35 mm film for still cameras
Slits cut into the well casing to allow groundwater to enter May be located at more than one level, to coincide with water-bearing strata in the earth
Round, curved, square or diamond-shaped holes punched in the upper leather of a shoe for ornamental purposes
The holes that are spaced along the length of the film in still cameras The perforation function as a guide for precision registration of film and also assist with the mechanical movement from frame to frame
Regularly spaced and accurately shaped holes which are punched throughout the length of a motion picture film These holes engage the teeth of various sprockets and pins by which the film is advanced and positioned as it travels through cameras, processing machines, and projectors ( Single or Double perforated film stock )
A series of small dots or dashes made in paper that allows and controls the tearing of paper Perfs are indicated on the marksheet by dashed lines
A serious complication of peptic ulcers where the ulcers penetrate through the stomach or duodenum allowing their contents to enter the peritoneal space
A series of small slits produced on a folder in the printed sheet, parallel to the fold at the bind edge, which permits the paper to be separated easily at these slits (perforations); also called Commercial Perforation to top
the act of punching a hole (especially a row of holes as for ease of separation) a line of small holes for tearing at a particular place a hole made in something; "a perforation of the eardrum
The punching out of holes between stamps to make separation easy 1) Comb perforation-three sides of a stamp are perforated at once, with the process repeated in rows 2) Harrow perforation-the entire sheet or unit of stamps is perforated in one operation 3) Line perforation-holes are punched one row at a time Line perforations are distinguished by the uneven crossing of perforation lines and irregular corners Comb and harrow perforations usually show alignment of holes at the corners Some forms of perforation may be difficult to distinguish