Prisms are commonly used in spectroscopy for dispersing or controlling the direction or polarisation of light. This can be helpful for splitting the incoming light into its wavelength components to ...

SO far, I have spoken of spectroscopes as spectroscopes -as one of the instruments the improvement of which should be cared for by every student in science. Their applications will come after. As may ...

IN his letter (NATURE, vol. xv. p. 449) Prof. Smyth makes a statement respecting the new “half-prism” spectroscope which I cannot help thinking must be founded on a misapprehension of the principle ...