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Excerpt from Introduction to Physical Science
Only in exceptional cases, such as work on specific gravity and electrical measurements, has it been found necessary to duplicate apparatus. The same apparatus may be kept on the desks through several exercises, or until every pupil has had an opportunity of using it. Ordinarily two pupils do not per form the same kind of experiment at the same time. With proper system, any teacher will find his labors lighter than under the old elaborate lecture system; and he will never have occasion to complain of a. Lack of interest on the part of his pupils.
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