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[ILLUSTRATION OMITTED] Etalon 12 Across An etalon is a device for studying spectra by splitting light into its component wavelengths. The etalon (also called the Fabry-Perot interferometer) consists of parallel, […]

Balance 10 Across For a pivoted beam to be in equilibrium, there must be no unbalanced moment about any point. In Figure 1, the moment of W1 about the pivot […]

Twine and tar 30 Across and 18 Down It was a long time ago that mankind discovered the strength of natural fibres. You've probably noticed that many grasses have enormous […]

Sunspot 1 Across One of the major turning-points in the history of Western science hinged on the life and work of the Italian Galileo Galilei (1564-1642, Figure 1). He lived […]

Eels 12 Across A cross-section through an eel is not a perfect circle so an eel is not a perfect cylinder, but I suspect you solved file clue and I […]

Slide rule and Napier's bones 6 Down, 7 Across and 4 Across In the notes to the previous Crossword in Physics REVIEW Vol. 17, No. 2, I described the life […]