Practical Work in General Physics for Use in Schools and Colleges (Classic Reprint)

Excerpt from Practical Work in General Physics for Use in Schools and Colleges

Another advantage in a course of this kind is to teach the student to look for errors he may have committed and to adopt means to eliminate them. However precise our observations or instruments, we neyer get the same number if we repeat an experiment. The errors involved may be (a) systematic errors, over which we have no control. For instance, the tempera ture of the room may alter, or the currents of air may affect the balance differently and may tend to give different results (b) constant errors, due to the graduation of the scale not being correct or the zero of the scale having altered: these, being due to the instrument used, can only be eliminated by com paring with a standard scale or by observing the zero error (n ote 4) (y) accidental errors, which may be got rid of in various ways according to the experiment we have in hand. The following means of neutralizing accidental errors may be noted.

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