Center of Gravity
That point of a body about which all its parts are balanced, or which, being supported, the whole body will remain at rest, though acted upon by gravity. Webster.
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Single-source entries: C (54)
These 18 listings are so strange that each appears in only one of the 7 encyclopedias we compared. They include such classics as Center of Gravity, Center of Gyration, Center of Motion.
Center of Gyration
That point in a body rotating around an axis, at which, if a given force were applied, it would produce the same angular velocity in a given time as it would if the whole mass of the body were collected at that point. Webster.
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Center of Motion
That point which remains at rest while all the other parts of a body revolve around it.
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Center Punch
A punch having a sharp point, for marking the center of work swung in a lathe, so that it may readily be removed and replaced without the trouble of finding the center each time.
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Center Seconds
See Sweep Seconds.
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Center Staff
The arbor, attached to the center wheel, which carries the minute hand.
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Center Wheel
The wheel whose staff carries the minute hand.
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Centering Indicator
In centering quickly on the universal head, this tool is indispensible. It will also be found valuable for other work. It is not kept by dealers, and will have to be made by the watchmaker. The body of the indicator is made of sheet brass, and should be about five inches long by two inches in width at the larger end. The shank C, is made to fit in rest holder, and is either riveted or soldered to the body; R is steel or copper wire sharpened to a fine point, and balances on a pivot at 1; B is a clock hand pivoted to the body at 1; 2 and 2 are pivot joints only, and do not go through the body; fig. C will perhaps give a better idea of the end R. To center with this tool, unscrew your rest and remove it, then place the shaft C, fig. 57, in rest holder and adjust it till the needle point R touches the top of hole as shown in Fig. 2. The index hand will then note the variations as the head revolves. If too low, the hand will point above center and if high, vice versa.
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Centering Tool
A small, steel point used for accurately locating centers. Fig. 58 illustrates the O. K. centering tool, which is made to fit any tailstock spindle or taper chuck. This tool is inserted in the tailstock spindle and the work to be centered is placed in a chuck or is cemented up on a cement plate. The work is now rotated and the tailstock advanced and the tool will cut an exact center, providing the work in the headstock is central. This tool will be found useful in determining centers when pivoting staffs and in drilling generally.
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Centers
Pins used in conjunction with a lathe for holding work while revolving. They are usually made of steel. They are of two forms, known as male and female centers.
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Centerville
a city of Iowa, the county-seat of Appanoose co. It is on the Chicago, Burlington, and Quincy, the Chicago, Rock Island, and Pacific, and the Southern Iowa Traction Company railroads. The city is an important livestock center. There are also mines of coal, gypsum, and limestone. Other industries are railway shops and manufactures of lumber, flour, iron, etc. Pop. (1910) 6,936; (1920) 8,486.
Only in Collier's New Encyclopedia
Centigrade Thermometer
a thermometer scaled to represent the interval between the freezing and the boiling point of water, divided into 100 equal parts, the freezing-point being taken as zero, and the boiling-point as 100°. 1° C. is equal to 1.8° F. CENTIME. See CENT.
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Central Falls
a town in Providence co., R. I., on the Blackstone river, and the New York, New Haven, and Hartford railroad, 4½ miles N. of Providence. It has large manufactories of cotton, woolen, silk, and hair cloth goods, and of machinery and leather, for which the river supplies excellent power. There are several churches, newspapers, and banks. Pop. (1910) 22,754; (1920) 24,174.
Only in Collier's New Encyclopedia
Central Wesleyan College
co-educational institution in Warrena ton, Mo., organized in 1864, under the Episcopal auspices of the Methodist the end of 1919: Church; reported at ; students professors and instructors, 22 , 325; number of graduates, 810; president, Otto E. Kriege, D. D.
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Centralia (City of Lewis co Wash midway)
a city of Lewis co., Wash., midway between Portland and Seattle. The chief industries are lumber, coal, and canned goods. The waterworks and electric lighting plant are municipally owned. There are two banks, excellent schools and a Carnegie library. Centralia was first settled in 1857 and became a city in 1890. It is under a commission form of government. A tragedy that startled the nation occurred there on Nov. 11, 1919, during a parade of war veterans to celebrate the first anniversary of the signing of the armistice. Concealed members of the I. W. W. opened fire on the procession and several of the soldiers were killed. One of the assailants was killed in the fighting that followed, another was lynched, and others charged with committing the crime were arrested and held for trial. Pop. (1910) 7,311; (1920) 7,549.
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Centralia (City of Marion miles S W)
a city of Marion miles S. W. of Chicago, on the Illinois co., Ill., 60 miles E. of St. Louis and 252 Central, the Chicago, Burlington and Quincy, the Southern, and the Southern Illinois railroads. It is located in the orchard section of southern Illinois, and its fruit trade is large. There are manufactories of iron, steel, envelopes, knit goods, flour, and butter, and the machine works of the Illinois Central railroad. There are three banks, ten churches, high schools, and publie schools, and a Carnegie library. Centralia was settled in 1853 and became a city in the following year. Pop. (1910) 9,680; (1920) 12,491.
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Centrifugal
a machine used in clarification and filtration, especially of sugar. The essential part is a circular as to be revolved vessel so constructed at a high rate of speed, which deposits the matter to be removed at the bottom, allowing the clear fluid to be drawn off.
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Centrifugal Force
The tendency that revolving bodies have to fly from the center. It is said that when balances are made too thin in the rim, they alter in diameter from this cause, in the long and short vibrations.
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