Experimental method

I. R. Walker

doi:10.1017/CBO9780511780608.015

14 - Experimental method

Published online by Cambridge University Press: 05 June 2012

I. R. Walker

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I. R. Walker: Affiliation:
University of Cambridge

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Introduction

The main purpose of this chapter is to examine certain trouble-prone aspects of experimental work that are often not considered, but if neglected can have major consequences. These include errors caused by the subconscious biases of experimenters, which are often the origin of mistaken conclusions in scientific research. In those areas of research that involve the study of material samples, very serious errors are commonly made because the true compositions of the samples are different from what is believed. This issue is also discussed below. The chapter also looks at the problems that can arise in reproducing the experimental measurements and techniques of other researchers. Several of the points are illustrated by historical examples. Some potential pitfalls in the analysis of data are discussed here, and also in Section 2.2.7.

Knowing apparatus and software

It is important to understand (at least at the conceptual level, if not in all the details) the inner workings of one's apparatus and software, and the theories they are based on. The effort needed to acquire this understanding is often avoided by experimenters. This tendency is encouraged by the ubiquitous presence in laboratories of highly automated commercial instruments, which are easy to treat as black boxes.

Having a conceptual understanding of apparatus and software can help to reduce human errors that might otherwise occur during their use (see page 17). Also, without such an understanding, the limitations and eccentricities of these things may not be readily perceived.

Type: Chapter
Information: Reliability in Scientific Research
Improving the Dependability of Measurements, Calculations, Equipment, and Software
, pp. 536 - 563

DOI: https://doi.org/10.1017/CBO9780511780608.015 [Opens in a new window]

Publisher: Cambridge University Press

Print publication year: 2011

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References

Wilson, E. Bright, Jr., An Introduction to Scientific Research, Dover, 1990. (Except for some minor modifications, this is a republication of a work that was originally published by McGraw-Hill in 1952. Hence some of the material is dated (particularly with regard to certain details about experimental apparatus and computing), but most is fundamental and therefore still relevant.)

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Jones, R. V., Instruments and Experiences: Papers on Measurement and Instrument Design, John Wiley & Sons, 1988.

For example, the American Institute of Physics operates an electronic depository for information (including video and audio files, data tables, lengthy printed matter, etc.) which is supplementary to that provided in its published articles. See Electronic Physics Auxiliary Publication Service (EPAPS). www.aip.org/pubservs/epaps.html

Collins, H. M., Changing Order: Replication and Induction in Scientific Practice, University of Chicago Press, 1992.

The example is from: Collins, H. M., Social Studies of Science 31, 71 (2001).

Braginsky, V. B., Mitrofanov, V. P., and Panov, V. I., Systems With Small Dissipation, University of Chicago Press, 1985.

Levine, J. L., Phys. Perspect. 6, 42 (2004).

Weber, J., Phys. Rev. Lett. 25, 180 (1970).

Levine, J. L. and Garwin, R. L., Phys. Rev. Lett. 31, 173 (1973).

Garwin, R. L. and Levine, J. L., Phys. Rev. Lett. 31, 176 (1973).

Osheroff, D. D., Richardson, R. C., and Lee, D. M., Phys. Rev. Lett. 28, 885 (1972).

Osheroff, D. D., Nobel Lecture, December 7, 1996. http://nobelprize.org/nobel_prizes/physics/laureates/1996/osheroff-lecture.pdf

Straty, G. C. and Adams, E. D., Rev. Sci. Instrum. 40, 1393 (1969).

Rabinovich, S., Measurement Errors: Theory and Practice, AIP Press, 1995.

Bevington, P. R. and Robinson, D. K., Data Reduction and Error Analysis for the Physical Sciences, 3rd edn, McGraw-Hill, 2002.

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14 - Experimental method

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