Perforation

Examples

• Thus, the paper passed between the drum and the two small wheels, and, as dry paper is a non-conductor, current was prevented from passing until a perforation was reached. Frank Lewis Dyer. Edison, His Life and Inventions.
• The Edison perforation method became the standard in America and finally throughout the world. Various. The Wonder Book of Knowledge.
• The films then had one perforation on either side of each picture. Various. The Wonder Book of Knowledge.
• Each machine was operated by a clerk, who translated the message into telegraphic characters and prepared the transmitting tape by punching the necessary perforations therein. Frank Lewis Dyer. Edison, His Life and Inventions.
• A very annoying feature until recently has been the losing of the lower film loop, due to poor patching of the film, tearing of the perforations in the films, etc. Various. The Wonder Book of Knowledge.
• The paper tape passed over a cylinder, and was kept in regular motion so as to receive the perforations in proper sequence. Frank Lewis Dyer. Edison, His Life and Inventions.
• The transmitting instrument had five small wheels or rollers, instead of two, for making contacts through the perforations and causing short electric impulses to pass over the lines. Frank Lewis Dyer. Edison, His Life and Inventions.
• A concrete example is presented in the illustration below, which shows a piece of tape with perforations representing the word same. Frank Lewis Dyer. Edison, His Life and Inventions.
• The writing is thus traced by means of a series of minute perforations in the sheet, from which, as a stencil, hundreds of copies can be made. Frank Lewis Dyer. Edison, His Life and Inventions.
• A two-inch galvanized iron pipe with a strong, pointed end containing small perforations is driven into the ground with a sledge hammer. Bertha M. Clark. General Science.
• In the margins are the perforations necessary to feed the film through the machine head. Various. The Wonder Book of Knowledge.
• The operation is such that colored marks upon the paper were made by the pens corresponding precisely to the perforations in the strip at the sending station. William Henry Doolittle. Inventions in the Century.
• The perforations of the containing tube, through which the electrolyte reaches the active material, are also shown in Fig. 7. Frank Lewis Dyer. Edison, His Life and Inventions.
• Matches are made round by one machine by pressing the block against a plate having circular perforations, and the interspaces are beveled so as to form cutting edges. William Henry Doolittle. Inventions in the Century.
• A certain group of perforations corresponds to a Morse group of dots and dashes for a letter of the alphabet. Frank Lewis Dyer. Edison, His Life and Inventions.

Inputed by Joe