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A program could be saved to mylar-based magnetically coated cards measuring 71 mm × 9.5 mm (2.8 in × 0.4 in), which were fed through the reader by a small electric motor through a worm gear and rubber roller at a speed of 6 cm/s (2.4 in/s). [3] The recording area used only half of the width of the card.
The roller is passed systematically across the surface to produce an even layer of ink. The roller is then applied to the forme, block, stone or plate so that the ink is evenly transferred to the raised or receptive areas before the next stage of transferring the ink, by moderate pressure, to the printing surface or offset substrate.
The center roller is a temperature controlled brass roller, the bottom roller is an oscillating rubber distribution roller. [3] The top roller is attached to a load cell which measures the tack at a given press speed (i.e. 800 feet per minute for a web press or 15000 sheets per hour for an offset press) [ citation needed ]
By the mid- to late-19th century, they had been largely superseded by the composition roller and the rubber roller or "brayer". [4] [5] The replacing of the labor-intensive ink balls, which had to be worked by hand, with mechanized rollers was a key factor to the growth of mechanized printing machines in the 19th century. [6]
A composition roller is a tool used in letterpress printing to apply ink to a bed of type in a printing press. It consists of a cylinder made of a substance known as "roller composition" or simply "composition", a mixture of hide glue and sugar (in the form of molasses or treacle ), with various additives such as glycerin depending on the ...
By 1970, a calculator could be made using just a few chips of low power consumption, allowing portable models powered from rechargeable batteries. The first handheld calculator was a 1967 prototype called Cal Tech, whose development was led by Jack Kilby at Texas Instruments in a research project to produce a portable calculator. It could add ...
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Because changing ink color in a mimeograph could be a laborious process, involving extensively cleaning the machine or, on newer models, replacing the drum or rollers, and then running the paper through the machine a second time, some fanzine publishers experimented with techniques for painting several colors on the pad.
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