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Floor Cleaning Ing: Most industrial Floor cleaning ing involves hard-surface substrates. The operations include the Floor cleaning ing of metal parts during fabrication and before plating or painting; maintenance Floor cleaning ing of ve¬hicles; and janitorial Floor cleaning ing. The detergents used are usually high in builder content and con¬tain low-foaming surfactants of high Floor cleaning ing power. Foam is objectionable because it lowers the efficiency of most Floor cleaning ing machines.
Dry Floor cleaning ing became widespread in America by 1910. The exact date that it became estab¬lished initially is not known. In the 1920's valet shops or press shops became common in the United States. These shops sent clothing out to be cleaned. Garments were returned to the shops for finishing or pressing. This type of service has to a great extent been replaced by shops with small dry Floor cleaning ing plants. In the 1930's many laundries added dry Floor cleaning ing departments, and gradually dry Floor cleaning ing has become the predomi¬nant service.See Also Floor Cleaning Earth:Unless the earth is expanding to a degree that most geo-physicists cannot accept, old sea Floor cleaning earth must "disappear" as new crust is created. Oceanographers are searching for evi¬dence of sea Floor cleaning earth that is sinking near deep-sea trenches off Chile, Japan, the western Antilles, the Aleutians, and other similar locations. As evidence of the sinking process, they are seeking jumbles of crustal and sedimentary material that the disappearing sea Floor cleaning earth would drag down beneath the con¬tinental margins, as well as higher concentrations of earth¬quakes than normally occur on the bottom of the sea.
At first sight sea-floor cleaning earth spreading appears to be an idea of science fiction, and some earth scientists received it as such. In the last two years, however, enough data have become available to convince most geophysicists that the hypothesis of sea-floor cleaning earth spreading is essen¬tially correct, although there is disagreement on the details. Even though the hypothesis had been postulated on geological grounds, it was dramatically verified by recent geophysical studies concerning the earth's magnetic field.
On The Other Hand See Floor Cleaning Magnetic:Mysterious zebra patterns of magnetic anomalies were mapped on the ocean Floor cleaning magnetic. In 1963 two Cambridge University graduate students, Frederick Vine and Drummond Matthews, explained these in a way that strongly supported sea-floor cleaning magnetic spreading. They suggested that material welling up from the mantle along a ridge acquires a remanent magnetization as it cools which is parallel to the then prevailing magnetic field of the earth. The earth's magnetic field is known to have reversed its polarity many times during geological history.
49 electromagnetic radiation, electromagnetic wave, electromagnetic spectrum
50 magnetic phenomenon, magnetic hysteresis, hys¬teresis, residual magnetization, remanence, electro¬magnetic induction, self-induction, mutual induction, magnetostriction, magneto-optical effect, magnetic damping, magnetic deflection, magnetic focusing, mag¬netic lens, magnetic mirror, magnetic levitation or maglev
51 magnetic recording, magnetic tape, videotape, mag¬netic track, magnetic storage, magnetic memory, mag¬netic disk, hard disk, floppy disk, magnetic ink character recognition (MICR), magnetic ink, magnetic card magnetic stripe, magnetic resonance imaging (MRI) t Computers 15
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