Perforations

例句:

• 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. 弗兰克·刘易斯·戴尔. 爱迪生的生平和发明.
• 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. 佚名. 神奇的知识之书.
• The paper tape passed over a cylinder, and was kept in regular motion so as to receive the perforations in proper sequence. 弗兰克·刘易斯·戴尔. 爱迪生的生平和发明.
• 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. 弗兰克·刘易斯·戴尔. 爱迪生的生平和发明.
• A concrete example is presented in the illustration below, which shows a piece of tape with perforations representing the word same. 弗兰克·刘易斯·戴尔. 爱迪生的生平和发明.
• 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. 弗兰克·刘易斯·戴尔. 爱迪生的生平和发明.
• A two-inch galvanized iron pipe with a strong, pointed end containing small perforations is driven into the ground with a sledge hammer. 伯莎M.克拉克. 科学通论.
• In the margins are the perforations necessary to feed the film through the machine head. 佚名. 神奇的知识之书.
• 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. 威廉·亨利·杜利特. 世纪发明.
• The perforations of the containing tube, through which the electrolyte reaches the active material, are also shown in Fig. 7. 弗兰克·刘易斯·戴尔. 爱迪生的生平和发明.
• 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. 威廉·亨利·杜利特. 世纪发明.
• A certain group of perforations corresponds to a Morse group of dots and dashes for a letter of the alphabet. 弗兰克·刘易斯·戴尔. 爱迪生的生平和发明.

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