The Bunsen-Kirchhoff Spectroscope. A short time ago, while walking through the rows of stalls at the Arezzo antiques fair, held every first Sunday of the month, I noticed on the table of one of the many stalls, the barely perceptible golden reflection of a Bunsen spectroscope, almost submerged by knick-knacks of every kind. It was a long and tiring negotiation …
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