IN studying the spectra of coloured solutions and solid substances by means of the spectrum microscope, it is most important to employ prisms having a suitable amount of dispersion. It would be a very ...

Philosophical Transactions of the Royal Society of London. Series A, Containing Papers of a Mathematical or Physical Character The Royal Society is a self-governing Fellowship of many of the world's ...

Life for the 19th-century astronomer was kind of monotonous, 200 years after Galileo's revolutionary work with the telescope. Astronomers had carefully tracked the motions of the planets, discovered a ...