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This paper presents a theory and related experiments on centrifugal barrel finishing. A calculation for the centrifugal force in the barrel is described. The limitation of the ratio between the rotation speed of the tubs and turrets, and values of polishing efficiency are determined by the calculation and compared with experimental results. It can be understood from the results why the polishing efficiency of the centrifugal barrel is far higher than that of the ordinary rotating barrel. Finally some considerations on design criteria are mentioned. [ABSTRACT FROM AUTHOR]

A study is reported of the removal of moisture from cotton-yarn packages by centrifugal force in the basket type of centrifuge or hydro-extractor. Equations describing the influence of time, centrifugal force, and package characteristics on the rate of moisture removal are developed. [ABSTRACT FROM AUTHOR]

The article presents information on display board in teaching language classes. Professor Klebaner in her article "Providing for ESL Pupils During the Total School Day" describes the use of the bulletin board as one of the supplements in integration of second language learners with the classes of native speakers. The display board has distinctive advantages. It enables the students to accustoms themselves in reading public newspapers. It also promotes community spirit because it aware the students of their common purpose and identity. The article author says that the advantages of display board can be multiplied if it will be treated as regular magazine. The teacher acts as an editor and the learners could be encouraged to put their personal contributions so that their motivation could also enhanced. The display board eases the professional reading because most items are clearly written on good quality white paper. It also helps the students to type speedily and efficiently, and also prompt them to volunteer their services on a rotating system.

Measures of reaction time were used to determine the level of the child's comprehension of the effects of a 180-degree rotation on the linear order of a row of objects. Reaction times to an apparent violation of the law governing rotation (a 180-degree rotation was contrived to produce the original instead of inverted order of objects) were significantly longer than reaction times to the expected outcome (inverted order) and were significantly related to whether the child had the cognitive structure necessary to comprehend the rotation phenomenon. The value of using reaction time to contrived unexpected events in order to determine the developmental level of cognitive structures described by Piaget was discussed. [ABSTRACT FROM AUTHOR]